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Finding the Fourth Proportional to 20,699.10, 31,031.10 and 7,543.80

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Solution

The fourth proportional to 20,699.10, 31,031.10 and 7,543.80 is: 11,309.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.10 : 31,031.10 = 7,543.80 : x
  2. Step 2: Convert to fraction form
    20,699.10/31,031.10 = 7,543.80/x
  3. Step 3: Cross multiply
    20,699.10x = 31,031.10 × 7,543.80
  4. Step 4: Simplify right side
    20,699.10x = 234,092,412.18
  5. Step 5: Solve for x
    x = 234,092,412.18/20,699.10
  6. Step 6: Final answer
    x = 11,309.30

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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.