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Finding the Fourth Proportional to 661,345.20, 992,017.80 and 439,729.20

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Solution

The fourth proportional to 661,345.20, 992,017.80 and 439,729.20 is: 659,593.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,345.20 : 992,017.80 = 439,729.20 : x
  2. Step 2: Convert to fraction form
    661,345.20/992,017.80 = 439,729.20/x
  3. Step 3: Cross multiply
    661,345.20x = 992,017.80 × 439,729.20
  4. Step 4: Simplify right side
    661,345.20x = 436,219,193,579.76
  5. Step 5: Solve for x
    x = 436,219,193,579.76/661,345.20
  6. Step 6: Final answer
    x = 659,593.80

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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.