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Finding the Fourth Proportional to 661,505.40, 992,258.10 and 288,257.40

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Solution

The fourth proportional to 661,505.40, 992,258.10 and 288,257.40 is: 432,386.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,505.40 : 992,258.10 = 288,257.40 : x
  2. Step 2: Convert to fraction form
    661,505.40/992,258.10 = 288,257.40/x
  3. Step 3: Cross multiply
    661,505.40x = 992,258.10 × 288,257.40
  4. Step 4: Simplify right side
    661,505.40x = 286,025,740,034.94
  5. Step 5: Solve for x
    x = 286,025,740,034.94/661,505.40
  6. Step 6: Final answer
    x = 432,386.10

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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.