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Finding the Fourth Proportional to 91,817.70, 137,726.55 and 87,929.70

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Solution

The fourth proportional to 91,817.70, 137,726.55 and 87,929.70 is: 131,894.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,817.70 : 137,726.55 = 87,929.70 : x
  2. Step 2: Convert to fraction form
    91,817.70/137,726.55 = 87,929.70/x
  3. Step 3: Cross multiply
    91,817.70x = 137,726.55 × 87,929.70
  4. Step 4: Simplify right side
    91,817.70x = 12,110,254,223.54
  5. Step 5: Solve for x
    x = 12,110,254,223.54/91,817.70
  6. Step 6: Final answer
    x = 131,894.55

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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.