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Finding the Fourth Proportional to 612,057.20, 918,085.80 and 470,339.60

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Solution

The fourth proportional to 612,057.20, 918,085.80 and 470,339.60 is: 705,509.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,057.20 : 918,085.80 = 470,339.60 : x
  2. Step 2: Convert to fraction form
    612,057.20/918,085.80 = 470,339.60/x
  3. Step 3: Cross multiply
    612,057.20x = 918,085.80 × 470,339.60
  4. Step 4: Simplify right side
    612,057.20x = 431,812,107,937.68
  5. Step 5: Solve for x
    x = 431,812,107,937.68/612,057.20
  6. Step 6: Final answer
    x = 705,509.40

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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.