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Finding the Fourth Proportional to 85,695.32, 128,319.42 and 68,963.96

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Solution

The fourth proportional to 85,695.32, 128,319.42 and 68,963.96 is: 103,266.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,695.32 : 128,319.42 = 68,963.96 : x
  2. Step 2: Convert to fraction form
    85,695.32/128,319.42 = 68,963.96/x
  3. Step 3: Cross multiply
    85,695.32x = 128,319.42 × 68,963.96
  4. Step 4: Simplify right side
    85,695.32x = 8,849,415,348.10
  5. Step 5: Solve for x
    x = 8,849,415,348.10/85,695.32
  6. Step 6: Final answer
    x = 103,266.03

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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.