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Finding the Fourth Proportional to 124,871.80, 187,307.70 and 72,416.20

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Solution

The fourth proportional to 124,871.80, 187,307.70 and 72,416.20 is: 108,624.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,871.80 : 187,307.70 = 72,416.20 : x
  2. Step 2: Convert to fraction form
    124,871.80/187,307.70 = 72,416.20/x
  3. Step 3: Cross multiply
    124,871.80x = 187,307.70 × 72,416.20
  4. Step 4: Simplify right side
    124,871.80x = 13,564,111,864.74
  5. Step 5: Solve for x
    x = 13,564,111,864.74/124,871.80
  6. Step 6: Final answer
    x = 108,624.30

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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.