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Finding the Fourth Proportional to 115,158.70, 158,916.90 and 64,857.70

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Solution

The fourth proportional to 115,158.70, 158,916.90 and 64,857.70 is: 89,502.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,158.70 : 158,916.90 = 64,857.70 : x
  2. Step 2: Convert to fraction form
    115,158.70/158,916.90 = 64,857.70/x
  3. Step 3: Cross multiply
    115,158.70x = 158,916.90 × 64,857.70
  4. Step 4: Simplify right side
    115,158.70x = 10,306,984,625.13
  5. Step 5: Solve for x
    x = 10,306,984,625.13/115,158.70
  6. Step 6: Final answer
    x = 89,502.44

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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.