Home / 20,987.55-28,964.86-15,673.14

Finding the Fourth Proportional to 20,987.55, 28,964.86 and 15,673.14

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Solution

The fourth proportional to 20,987.55, 28,964.86 and 15,673.14 is: 21,630.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.55 : 28,964.86 = 15,673.14 : x
  2. Step 2: Convert to fraction form
    20,987.55/28,964.86 = 15,673.14/x
  3. Step 3: Cross multiply
    20,987.55x = 28,964.86 × 15,673.14
  4. Step 4: Simplify right side
    20,987.55x = 453,970,082.67
  5. Step 5: Solve for x
    x = 453,970,082.67/20,987.55
  6. Step 6: Final answer
    x = 21,630.45

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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.