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Finding the Fourth Proportional to 85,356.10, 128,034.15 and 54,328.90

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Solution

The fourth proportional to 85,356.10, 128,034.15 and 54,328.90 is: 81,493.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,356.10 : 128,034.15 = 54,328.90 : x
  2. Step 2: Convert to fraction form
    85,356.10/128,034.15 = 54,328.90/x
  3. Step 3: Cross multiply
    85,356.10x = 128,034.15 × 54,328.90
  4. Step 4: Simplify right side
    85,356.10x = 6,955,954,531.94
  5. Step 5: Solve for x
    x = 6,955,954,531.94/85,356.10
  6. Step 6: Final answer
    x = 81,493.35

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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.