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Finding the Fourth Proportional to 72,916.80, 109,490.40 and 53,332.80

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Solution

The fourth proportional to 72,916.80, 109,490.40 and 53,332.80 is: 80,083.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,916.80 : 109,490.40 = 53,332.80 : x
  2. Step 2: Convert to fraction form
    72,916.80/109,490.40 = 53,332.80/x
  3. Step 3: Cross multiply
    72,916.80x = 109,490.40 × 53,332.80
  4. Step 4: Simplify right side
    72,916.80x = 5,839,429,605.12
  5. Step 5: Solve for x
    x = 5,839,429,605.12/72,916.80
  6. Step 6: Final answer
    x = 80,083.46

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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.