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Finding the Fourth Proportional to 145,640.19, 218,545.20 and 61,395.20

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Solution

The fourth proportional to 145,640.19, 218,545.20 and 61,395.20 is: 92,128.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,640.19 : 218,545.20 = 61,395.20 : x
  2. Step 2: Convert to fraction form
    145,640.19/218,545.20 = 61,395.20/x
  3. Step 3: Cross multiply
    145,640.19x = 218,545.20 × 61,395.20
  4. Step 4: Simplify right side
    145,640.19x = 13,417,625,170.31
  5. Step 5: Solve for x
    x = 13,417,625,170.31/145,640.19
  6. Step 6: Final answer
    x = 92,128.59

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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.