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Finding the Fourth Proportional to 139,025.40, 208,538.10 and 86,407.80

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Solution

The fourth proportional to 139,025.40, 208,538.10 and 86,407.80 is: 129,611.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,025.40 : 208,538.10 = 86,407.80 : x
  2. Step 2: Convert to fraction form
    139,025.40/208,538.10 = 86,407.80/x
  3. Step 3: Cross multiply
    139,025.40x = 208,538.10 × 86,407.80
  4. Step 4: Simplify right side
    139,025.40x = 18,019,318,437.18
  5. Step 5: Solve for x
    x = 18,019,318,437.18/139,025.40
  6. Step 6: Final answer
    x = 129,611.70

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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.