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Finding the Fourth Proportional to 81,909.55, 112,991.83 and 56,371.58

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Solution

The fourth proportional to 81,909.55, 112,991.83 and 56,371.58 is: 77,762.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,909.55 : 112,991.83 = 56,371.58 : x
  2. Step 2: Convert to fraction form
    81,909.55/112,991.83 = 56,371.58/x
  3. Step 3: Cross multiply
    81,909.55x = 112,991.83 × 56,371.58
  4. Step 4: Simplify right side
    81,909.55x = 6,369,527,984.19
  5. Step 5: Solve for x
    x = 6,369,527,984.19/81,909.55
  6. Step 6: Final answer
    x = 77,762.95

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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.