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Finding the Fourth Proportional to 85,915.43, 128,967.42 and 68,259.58

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Solution

The fourth proportional to 85,915.43, 128,967.42 and 68,259.58 is: 102,464.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,915.43 : 128,967.42 = 68,259.58 : x
  2. Step 2: Convert to fraction form
    85,915.43/128,967.42 = 68,259.58/x
  3. Step 3: Cross multiply
    85,915.43x = 128,967.42 × 68,259.58
  4. Step 4: Simplify right side
    85,915.43x = 8,803,261,600.47
  5. Step 5: Solve for x
    x = 8,803,261,600.47/85,915.43
  6. Step 6: Final answer
    x = 102,464.27

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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.