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Finding the Fourth Proportional to 85,326.40, 127,989.60 and 29,915.20

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Solution

The fourth proportional to 85,326.40, 127,989.60 and 29,915.20 is: 44,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,326.40 : 127,989.60 = 29,915.20 : x
  2. Step 2: Convert to fraction form
    85,326.40/127,989.60 = 29,915.20/x
  3. Step 3: Cross multiply
    85,326.40x = 127,989.60 × 29,915.20
  4. Step 4: Simplify right side
    85,326.40x = 3,828,834,481.92
  5. Step 5: Solve for x
    x = 3,828,834,481.92/85,326.40
  6. Step 6: Final answer
    x = 44,872.80

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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.