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Finding the Fourth Proportional to 72,225.64, 99,672.42 and 40,395.88

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Solution

The fourth proportional to 72,225.64, 99,672.42 and 40,395.88 is: 55,746.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,225.64 : 99,672.42 = 40,395.88 : x
  2. Step 2: Convert to fraction form
    72,225.64/99,672.42 = 40,395.88/x
  3. Step 3: Cross multiply
    72,225.64x = 99,672.42 × 40,395.88
  4. Step 4: Simplify right side
    72,225.64x = 4,026,355,117.63
  5. Step 5: Solve for x
    x = 4,026,355,117.63/72,225.64
  6. Step 6: Final answer
    x = 55,746.89

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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.