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Finding the Fourth Proportional to 85,920.18, 128,974.54 and 68,264.32

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Solution

The fourth proportional to 85,920.18, 128,974.54 and 68,264.32 is: 102,471.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.18 : 128,974.54 = 68,264.32 : x
  2. Step 2: Convert to fraction form
    85,920.18/128,974.54 = 68,264.32/x
  3. Step 3: Cross multiply
    85,920.18x = 128,974.54 × 68,264.32
  4. Step 4: Simplify right side
    85,920.18x = 8,804,359,270.41
  5. Step 5: Solve for x
    x = 8,804,359,270.41/85,920.18
  6. Step 6: Final answer
    x = 102,471.38

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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.