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Finding the Fourth Proportional to 57,009.80, 85,368.90 and 42,138.20

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Solution

The fourth proportional to 57,009.80, 85,368.90 and 42,138.20 is: 63,099.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,009.80 : 85,368.90 = 42,138.20 : x
  2. Step 2: Convert to fraction form
    57,009.80/85,368.90 = 42,138.20/x
  3. Step 3: Cross multiply
    57,009.80x = 85,368.90 × 42,138.20
  4. Step 4: Simplify right side
    57,009.80x = 3,597,291,781.98
  5. Step 5: Solve for x
    x = 3,597,291,781.98/57,009.80
  6. Step 6: Final answer
    x = 63,099.53

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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.