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Finding the Fourth Proportional to 20,643.98, 28,500.50 and 13,590.90

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Solution

The fourth proportional to 20,643.98, 28,500.50 and 13,590.90 is: 18,763.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.98 : 28,500.50 = 13,590.90 : x
  2. Step 2: Convert to fraction form
    20,643.98/28,500.50 = 13,590.90/x
  3. Step 3: Cross multiply
    20,643.98x = 28,500.50 × 13,590.90
  4. Step 4: Simplify right side
    20,643.98x = 387,347,445.45
  5. Step 5: Solve for x
    x = 387,347,445.45/20,643.98
  6. Step 6: Final answer
    x = 18,763.22

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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.