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Finding the Fourth Proportional to 64,872.61, 89,508.95 and 39,378.34

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Solution

The fourth proportional to 64,872.61, 89,508.95 and 39,378.34 is: 54,332.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,872.61 : 89,508.95 = 39,378.34 : x
  2. Step 2: Convert to fraction form
    64,872.61/89,508.95 = 39,378.34/x
  3. Step 3: Cross multiply
    64,872.61x = 89,508.95 × 39,378.34
  4. Step 4: Simplify right side
    64,872.61x = 3,524,714,180.55
  5. Step 5: Solve for x
    x = 3,524,714,180.55/64,872.61
  6. Step 6: Final answer
    x = 54,332.85

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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.