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Finding the Fourth Proportional to 661,504.50, 991,008.12 and 390,824.97

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Solution

The fourth proportional to 661,504.50, 991,008.12 and 390,824.97 is: 585,499.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,504.50 : 991,008.12 = 390,824.97 : x
  2. Step 2: Convert to fraction form
    661,504.50/991,008.12 = 390,824.97/x
  3. Step 3: Cross multiply
    661,504.50x = 991,008.12 × 390,824.97
  4. Step 4: Simplify right side
    661,504.50x = 387,310,718,768.76
  5. Step 5: Solve for x
    x = 387,310,718,768.76/661,504.50
  6. Step 6: Final answer
    x = 585,499.75

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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.