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Finding the Fourth Proportional to 72,292.88, 108,439.32 and 19,701.20

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Solution

The fourth proportional to 72,292.88, 108,439.32 and 19,701.20 is: 29,551.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,292.88 : 108,439.32 = 19,701.20 : x
  2. Step 2: Convert to fraction form
    72,292.88/108,439.32 = 19,701.20/x
  3. Step 3: Cross multiply
    72,292.88x = 108,439.32 × 19,701.20
  4. Step 4: Simplify right side
    72,292.88x = 2,136,384,731.18
  5. Step 5: Solve for x
    x = 2,136,384,731.18/72,292.88
  6. Step 6: Final answer
    x = 29,551.80

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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.