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Finding the Fourth Proportional to 57,209.70, 85,814.55 and 52,140.90

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Solution

The fourth proportional to 57,209.70, 85,814.55 and 52,140.90 is: 78,211.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,209.70 : 85,814.55 = 52,140.90 : x
  2. Step 2: Convert to fraction form
    57,209.70/85,814.55 = 52,140.90/x
  3. Step 3: Cross multiply
    57,209.70x = 85,814.55 × 52,140.90
  4. Step 4: Simplify right side
    57,209.70x = 4,474,447,870.10
  5. Step 5: Solve for x
    x = 4,474,447,870.10/57,209.70
  6. Step 6: Final answer
    x = 78,211.35

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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.