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Finding the Fourth Proportional to 72,511.83, 99,838.92 and 65,868.78

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Solution

The fourth proportional to 72,511.83, 99,838.92 and 65,868.78 is: 90,692.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,511.83 : 99,838.92 = 65,868.78 : x
  2. Step 2: Convert to fraction form
    72,511.83/99,838.92 = 65,868.78/x
  3. Step 3: Cross multiply
    72,511.83x = 99,838.92 × 65,868.78
  4. Step 4: Simplify right side
    72,511.83x = 6,576,267,856.92
  5. Step 5: Solve for x
    x = 6,576,267,856.92/72,511.83
  6. Step 6: Final answer
    x = 90,692.34

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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.