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Finding the Fourth Proportional to 85,539.60, 128,528.10 and 75,916.80

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Solution

The fourth proportional to 85,539.60, 128,528.10 and 75,916.80 is: 114,069.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,539.60 : 128,528.10 = 75,916.80 : x
  2. Step 2: Convert to fraction form
    85,539.60/128,528.10 = 75,916.80/x
  3. Step 3: Cross multiply
    85,539.60x = 128,528.10 × 75,916.80
  4. Step 4: Simplify right side
    85,539.60x = 9,757,442,062.08
  5. Step 5: Solve for x
    x = 9,757,442,062.08/85,539.60
  6. Step 6: Final answer
    x = 114,069.30

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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.