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Finding the Fourth Proportional to 85,385.70, 127,915.35 and 45,929.70

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Solution

The fourth proportional to 85,385.70, 127,915.35 and 45,929.70 is: 68,806.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,385.70 : 127,915.35 = 45,929.70 : x
  2. Step 2: Convert to fraction form
    85,385.70/127,915.35 = 45,929.70/x
  3. Step 3: Cross multiply
    85,385.70x = 127,915.35 × 45,929.70
  4. Step 4: Simplify right side
    85,385.70x = 5,875,113,650.90
  5. Step 5: Solve for x
    x = 5,875,113,650.90/85,385.70
  6. Step 6: Final answer
    x = 68,806.76

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1.5x scale

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.