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Finding the Fourth Proportional to 85,750.80, 128,699.10 and 38,438.70

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Solution

The fourth proportional to 85,750.80, 128,699.10 and 38,438.70 is: 57,690.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,750.80 : 128,699.10 = 38,438.70 : x
  2. Step 2: Convert to fraction form
    85,750.80/128,699.10 = 38,438.70/x
  3. Step 3: Cross multiply
    85,750.80x = 128,699.10 × 38,438.70
  4. Step 4: Simplify right side
    85,750.80x = 4,947,026,095.17
  5. Step 5: Solve for x
    x = 4,947,026,095.17/85,750.80
  6. Step 6: Final answer
    x = 57,690.73

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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.