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Finding the Fourth Proportional to 124,895.40, 187,343.10 and 72,407.40

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Solution

The fourth proportional to 124,895.40, 187,343.10 and 72,407.40 is: 108,611.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,895.40 : 187,343.10 = 72,407.40 : x
  2. Step 2: Convert to fraction form
    124,895.40/187,343.10 = 72,407.40/x
  3. Step 3: Cross multiply
    124,895.40x = 187,343.10 × 72,407.40
  4. Step 4: Simplify right side
    124,895.40x = 13,565,026,778.94
  5. Step 5: Solve for x
    x = 13,565,026,778.94/124,895.40
  6. Step 6: Final answer
    x = 108,611.10

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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.