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Finding the Fourth Proportional to 81,491.80, 112,463.34 and 61,312.54

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Solution

The fourth proportional to 81,491.80, 112,463.34 and 61,312.54 is: 84,614.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,491.80 : 112,463.34 = 61,312.54 : x
  2. Step 2: Convert to fraction form
    81,491.80/112,463.34 = 61,312.54/x
  3. Step 3: Cross multiply
    81,491.80x = 112,463.34 × 61,312.54
  4. Step 4: Simplify right side
    81,491.80x = 6,895,413,032.28
  5. Step 5: Solve for x
    x = 6,895,413,032.28/81,491.80
  6. Step 6: Final answer
    x = 84,614.81

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1.5x scale

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.