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Finding the Fourth Proportional to 72,403.80, 108,411.30 and 56,722.20

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Solution

The fourth proportional to 72,403.80, 108,411.30 and 56,722.20 is: 84,931.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,403.80 : 108,411.30 = 56,722.20 : x
  2. Step 2: Convert to fraction form
    72,403.80/108,411.30 = 56,722.20/x
  3. Step 3: Cross multiply
    72,403.80x = 108,411.30 × 56,722.20
  4. Step 4: Simplify right side
    72,403.80x = 6,149,327,440.86
  5. Step 5: Solve for x
    x = 6,149,327,440.86/72,403.80
  6. Step 6: Final answer
    x = 84,931.00

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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.