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Finding the Fourth Proportional to 918,800.56, 1,378,200.84 and 287,763.76

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Solution

The fourth proportional to 918,800.56, 1,378,200.84 and 287,763.76 is: 431,645.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,800.56 : 1,378,200.84 = 287,763.76 : x
  2. Step 2: Convert to fraction form
    918,800.56/1,378,200.84 = 287,763.76/x
  3. Step 3: Cross multiply
    918,800.56x = 1,378,200.84 × 287,763.76
  4. Step 4: Simplify right side
    918,800.56x = 396,596,255,753.56
  5. Step 5: Solve for x
    x = 396,596,255,753.56/918,800.56
  6. Step 6: Final answer
    x = 431,645.64

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.