Home / 20,390.56-28,140.28-11,316.28

Finding the Fourth Proportional to 20,390.56, 28,140.28 and 11,316.28

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Solution

The fourth proportional to 20,390.56, 28,140.28 and 11,316.28 is: 15,617.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.56 : 28,140.28 = 11,316.28 : x
  2. Step 2: Convert to fraction form
    20,390.56/28,140.28 = 11,316.28/x
  3. Step 3: Cross multiply
    20,390.56x = 28,140.28 × 11,316.28
  4. Step 4: Simplify right side
    20,390.56x = 318,443,287.76
  5. Step 5: Solve for x
    x = 318,443,287.76/20,390.56
  6. Step 6: Final answer
    x = 15,617.19

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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.