Home / 20,430.81-28,197.15-11,478.30

Finding the Fourth Proportional to 20,430.81, 28,197.15 and 11,478.30

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Solution

The fourth proportional to 20,430.81, 28,197.15 and 11,478.30 is: 15,841.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.81 : 28,197.15 = 11,478.30 : x
  2. Step 2: Convert to fraction form
    20,430.81/28,197.15 = 11,478.30/x
  3. Step 3: Cross multiply
    20,430.81x = 28,197.15 × 11,478.30
  4. Step 4: Simplify right side
    20,430.81x = 323,655,346.85
  5. Step 5: Solve for x
    x = 323,655,346.85/20,430.81
  6. Step 6: Final answer
    x = 15,841.53

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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.