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Finding the Fourth Proportional to 91,721.40, 137,711.70 and 56,729.40

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Solution

The fourth proportional to 91,721.40, 137,711.70 and 56,729.40 is: 85,174.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,721.40 : 137,711.70 = 56,729.40 : x
  2. Step 2: Convert to fraction form
    91,721.40/137,711.70 = 56,729.40/x
  3. Step 3: Cross multiply
    91,721.40x = 137,711.70 × 56,729.40
  4. Step 4: Simplify right side
    91,721.40x = 7,812,302,113.98
  5. Step 5: Solve for x
    x = 7,812,302,113.98/91,721.40
  6. Step 6: Final answer
    x = 85,174.26

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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.