Home / 15,420.18-21,290.13-10,391.88

Finding the Fourth Proportional to 15,420.18, 21,290.13 and 10,391.88

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Solution

The fourth proportional to 15,420.18, 21,290.13 and 10,391.88 is: 14,347.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.18 : 21,290.13 = 10,391.88 : x
  2. Step 2: Convert to fraction form
    15,420.18/21,290.13 = 10,391.88/x
  3. Step 3: Cross multiply
    15,420.18x = 21,290.13 × 10,391.88
  4. Step 4: Simplify right side
    15,420.18x = 221,244,476.14
  5. Step 5: Solve for x
    x = 221,244,476.14/15,420.18
  6. Step 6: Final answer
    x = 14,347.72

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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.