Home / 918,812.56-1,378,218.84-287,775.76

Finding the Fourth Proportional to 918,812.56, 1,378,218.84 and 287,775.76

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Solution

The fourth proportional to 918,812.56, 1,378,218.84 and 287,775.76 is: 431,663.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,812.56 : 1,378,218.84 = 287,775.76 : x
  2. Step 2: Convert to fraction form
    918,812.56/1,378,218.84 = 287,775.76/x
  3. Step 3: Cross multiply
    918,812.56x = 1,378,218.84 × 287,775.76
  4. Step 4: Simplify right side
    918,812.56x = 396,617,974,127.32
  5. Step 5: Solve for x
    x = 396,617,974,127.32/918,812.56
  6. Step 6: Final answer
    x = 431,663.64

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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.