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Finding the Fourth Proportional to 138,390.64, 207,511.72 and 43,603.12

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Solution

The fourth proportional to 138,390.64, 207,511.72 and 43,603.12 is: 65,381.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,390.64 : 207,511.72 = 43,603.12 : x
  2. Step 2: Convert to fraction form
    138,390.64/207,511.72 = 43,603.12/x
  3. Step 3: Cross multiply
    138,390.64x = 207,511.72 × 43,603.12
  4. Step 4: Simplify right side
    138,390.64x = 9,048,158,428.57
  5. Step 5: Solve for x
    x = 9,048,158,428.57/138,390.64
  6. Step 6: Final answer
    x = 65,381.29

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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.