Home / 20,690.90-28,549.11-13,531.31

Finding the Fourth Proportional to 20,690.90, 28,549.11 and 13,531.31

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Solution

The fourth proportional to 20,690.90, 28,549.11 and 13,531.31 is: 18,670.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,690.90 : 28,549.11 = 13,531.31 : x
  2. Step 2: Convert to fraction form
    20,690.90/28,549.11 = 13,531.31/x
  3. Step 3: Cross multiply
    20,690.90x = 28,549.11 × 13,531.31
  4. Step 4: Simplify right side
    20,690.90x = 386,306,714.89
  5. Step 5: Solve for x
    x = 386,306,714.89/20,690.90
  6. Step 6: Final answer
    x = 18,670.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.