Home / 15,420.72-21,261.20-12,585.18

Finding the Fourth Proportional to 15,420.72, 21,261.20 and 12,585.18

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Solution

The fourth proportional to 15,420.72, 21,261.20 and 12,585.18 is: 17,351.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.72 : 21,261.20 = 12,585.18 : x
  2. Step 2: Convert to fraction form
    15,420.72/21,261.20 = 12,585.18/x
  3. Step 3: Cross multiply
    15,420.72x = 21,261.20 × 12,585.18
  4. Step 4: Simplify right side
    15,420.72x = 267,576,029.02
  5. Step 5: Solve for x
    x = 267,576,029.02/15,420.72
  6. Step 6: Final answer
    x = 17,351.72

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Double scale
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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.