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Finding the Fourth Proportional to 100,894.47, 139,235.31 and 55,572.61

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Solution

The fourth proportional to 100,894.47, 139,235.31 and 55,572.61 is: 76,690.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,894.47 : 139,235.31 = 55,572.61 : x
  2. Step 2: Convert to fraction form
    100,894.47/139,235.31 = 55,572.61/x
  3. Step 3: Cross multiply
    100,894.47x = 139,235.31 × 55,572.61
  4. Step 4: Simplify right side
    100,894.47x = 7,737,669,580.86
  5. Step 5: Solve for x
    x = 7,737,669,580.86/100,894.47
  6. Step 6: Final answer
    x = 76,690.72

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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.