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Finding the Fourth Proportional to 128,591.02, 192,702.72 and 72,313.00

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Solution

The fourth proportional to 128,591.02, 192,702.72 and 72,313.00 is: 108,366.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,591.02 : 192,702.72 = 72,313.00 : x
  2. Step 2: Convert to fraction form
    128,591.02/192,702.72 = 72,313.00/x
  3. Step 3: Cross multiply
    128,591.02x = 192,702.72 × 72,313.00
  4. Step 4: Simplify right side
    128,591.02x = 13,934,911,580.78
  5. Step 5: Solve for x
    x = 13,934,911,580.78/128,591.02
  6. Step 6: Final answer
    x = 108,366.13

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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.