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Finding the Fourth Proportional to 87,178.79, 120,275.79 and 56,981.55

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Solution

The fourth proportional to 87,178.79, 120,275.79 and 56,981.55 is: 78,614.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,178.79 : 120,275.79 = 56,981.55 : x
  2. Step 2: Convert to fraction form
    87,178.79/120,275.79 = 56,981.55/x
  3. Step 3: Cross multiply
    87,178.79x = 120,275.79 × 56,981.55
  4. Step 4: Simplify right side
    87,178.79x = 6,853,500,941.67
  5. Step 5: Solve for x
    x = 6,853,500,941.67/87,178.79
  6. Step 6: Final answer
    x = 78,614.32

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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.