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Finding the Fourth Proportional to 865,619.40, 1,298,429.10 and 865,619.40

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Solution

The fourth proportional to 865,619.40, 1,298,429.10 and 865,619.40 is: 1,298,429.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    865,619.40 : 1,298,429.10 = 865,619.40 : x
  2. Step 2: Convert to fraction form
    865,619.40/1,298,429.10 = 865,619.40/x
  3. Step 3: Cross multiply
    865,619.40x = 1,298,429.10 × 865,619.40
  4. Step 4: Simplify right side
    865,619.40x = 1,123,945,418,484.54
  5. Step 5: Solve for x
    x = 1,123,945,418,484.54/865,619.40
  6. Step 6: Final answer
    x = 1,298,429.10

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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.