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Finding the Fourth Proportional to 139,445.80, 209,082.30 and 80,252.20

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Solution

The fourth proportional to 139,445.80, 209,082.30 and 80,252.20 is: 120,328.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,445.80 : 209,082.30 = 80,252.20 : x
  2. Step 2: Convert to fraction form
    139,445.80/209,082.30 = 80,252.20/x
  3. Step 3: Cross multiply
    139,445.80x = 209,082.30 × 80,252.20
  4. Step 4: Simplify right side
    139,445.80x = 16,779,314,556.06
  5. Step 5: Solve for x
    x = 16,779,314,556.06/139,445.80
  6. Step 6: Final answer
    x = 120,328.58

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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.