Home / 10,521.90-15,782.85-3,126.20

Finding the Fourth Proportional to 10,521.90, 15,782.85 and 3,126.20

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Solution

The fourth proportional to 10,521.90, 15,782.85 and 3,126.20 is: 4,689.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,521.90 : 15,782.85 = 3,126.20 : x
  2. Step 2: Convert to fraction form
    10,521.90/15,782.85 = 3,126.20/x
  3. Step 3: Cross multiply
    10,521.90x = 15,782.85 × 3,126.20
  4. Step 4: Simplify right side
    10,521.90x = 49,340,266.76
  5. Step 5: Solve for x
    x = 49,340,266.76/10,521.90
  6. Step 6: Final answer
    x = 4,689.29

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.