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Finding the Fourth Proportional to 85,686.82, 128,306.67 and 68,955.46

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Solution

The fourth proportional to 85,686.82, 128,306.67 and 68,955.46 is: 103,253.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,686.82 : 128,306.67 = 68,955.46 : x
  2. Step 2: Convert to fraction form
    85,686.82/128,306.67 = 68,955.46/x
  3. Step 3: Cross multiply
    85,686.82x = 128,306.67 × 68,955.46
  4. Step 4: Simplify right side
    85,686.82x = 8,847,445,450.92
  5. Step 5: Solve for x
    x = 8,847,445,450.92/85,686.82
  6. Step 6: Final answer
    x = 103,253.28

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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.