Home / 21,217.90-31,830.29-7,178.78

Finding the Fourth Proportional to 21,217.90, 31,830.29 and 7,178.78

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Solution

The fourth proportional to 21,217.90, 31,830.29 and 7,178.78 is: 10,769.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,217.90 : 31,830.29 = 7,178.78 : x
  2. Step 2: Convert to fraction form
    21,217.90/31,830.29 = 7,178.78/x
  3. Step 3: Cross multiply
    21,217.90x = 31,830.29 × 7,178.78
  4. Step 4: Simplify right side
    21,217.90x = 228,502,649.25
  5. Step 5: Solve for x
    x = 228,502,649.25/21,217.90
  6. Step 6: Final answer
    x = 10,769.33

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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.