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Finding the Fourth Proportional to 20,595.80, 28,421.10 and 11,642.78

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Solution

The fourth proportional to 20,595.80, 28,421.10 and 11,642.78 is: 16,066.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,595.80 : 28,421.10 = 11,642.78 : x
  2. Step 2: Convert to fraction form
    20,595.80/28,421.10 = 11,642.78/x
  3. Step 3: Cross multiply
    20,595.80x = 28,421.10 × 11,642.78
  4. Step 4: Simplify right side
    20,595.80x = 330,900,685.71
  5. Step 5: Solve for x
    x = 330,900,685.71/20,595.80
  6. Step 6: Final answer
    x = 16,066.41

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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.