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Finding the Fourth Proportional to 125,128.80, 187,709.40 and 61,981.20

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Solution

The fourth proportional to 125,128.80, 187,709.40 and 61,981.20 is: 92,979.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,128.80 : 187,709.40 = 61,981.20 : x
  2. Step 2: Convert to fraction form
    125,128.80/187,709.40 = 61,981.20/x
  3. Step 3: Cross multiply
    125,128.80x = 187,709.40 × 61,981.20
  4. Step 4: Simplify right side
    125,128.80x = 11,634,453,863.28
  5. Step 5: Solve for x
    x = 11,634,453,863.28/125,128.80
  6. Step 6: Final answer
    x = 92,979.82

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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.