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Finding the Fourth Proportional to 139,417.70, 209,126.55 and 100,343.30

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Solution

The fourth proportional to 139,417.70, 209,126.55 and 100,343.30 is: 150,514.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,417.70 : 209,126.55 = 100,343.30 : x
  2. Step 2: Convert to fraction form
    139,417.70/209,126.55 = 100,343.30/x
  3. Step 3: Cross multiply
    139,417.70x = 209,126.55 × 100,343.30
  4. Step 4: Simplify right side
    139,417.70x = 20,984,448,144.62
  5. Step 5: Solve for x
    x = 20,984,448,144.62/139,417.70
  6. Step 6: Final answer
    x = 150,514.95

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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.