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Finding the Fourth Proportional to 21,167.40, 31,751.10 and 20,802.90

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Solution

The fourth proportional to 21,167.40, 31,751.10 and 20,802.90 is: 31,204.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,167.40 : 31,751.10 = 20,802.90 : x
  2. Step 2: Convert to fraction form
    21,167.40/31,751.10 = 20,802.90/x
  3. Step 3: Cross multiply
    21,167.40x = 31,751.10 × 20,802.90
  4. Step 4: Simplify right side
    21,167.40x = 660,514,958.19
  5. Step 5: Solve for x
    x = 660,514,958.19/21,167.40
  6. Step 6: Final answer
    x = 31,204.35

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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.