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Finding the Fourth Proportional to 100,603.42, 138,875.28 and 67,904.92

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Solution

The fourth proportional to 100,603.42, 138,875.28 and 67,904.92 is: 93,737.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,603.42 : 138,875.28 = 67,904.92 : x
  2. Step 2: Convert to fraction form
    100,603.42/138,875.28 = 67,904.92/x
  3. Step 3: Cross multiply
    100,603.42x = 138,875.28 × 67,904.92
  4. Step 4: Simplify right side
    100,603.42x = 9,430,314,778.38
  5. Step 5: Solve for x
    x = 9,430,314,778.38/100,603.42
  6. Step 6: Final answer
    x = 93,737.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.