Home / 20,802.90-31,215.15-9,117.30

Finding the Fourth Proportional to 20,802.90, 31,215.15 and 9,117.30

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Solution

The fourth proportional to 20,802.90, 31,215.15 and 9,117.30 is: 13,680.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,802.90 : 31,215.15 = 9,117.30 : x
  2. Step 2: Convert to fraction form
    20,802.90/31,215.15 = 9,117.30/x
  3. Step 3: Cross multiply
    20,802.90x = 31,215.15 × 9,117.30
  4. Step 4: Simplify right side
    20,802.90x = 284,597,887.10
  5. Step 5: Solve for x
    x = 284,597,887.10/20,802.90
  6. Step 6: Final answer
    x = 13,680.68

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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.