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Finding the Fourth Proportional to 109,920, 151,689.61 and 62,172.32

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Solution

The fourth proportional to 109,920, 151,689.61 and 62,172.32 is: 85,797.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,920 : 151,689.61 = 62,172.32 : x
  2. Step 2: Convert to fraction form
    109,920/151,689.61 = 62,172.32/x
  3. Step 3: Cross multiply
    109,920x = 151,689.61 × 62,172.32
  4. Step 4: Simplify right side
    109,920x = 9,430,894,973.60
  5. Step 5: Solve for x
    x = 9,430,894,973.60/109,920
  6. Step 6: Final answer
    x = 85,797.81

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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.