Home / 21,291.72-31,937.78-7,440.76

Finding the Fourth Proportional to 21,291.72, 31,937.78 and 7,440.76

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Solution

The fourth proportional to 21,291.72, 31,937.78 and 7,440.76 is: 11,161.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,291.72 : 31,937.78 = 7,440.76 : x
  2. Step 2: Convert to fraction form
    21,291.72/31,937.78 = 7,440.76/x
  3. Step 3: Cross multiply
    21,291.72x = 31,937.78 × 7,440.76
  4. Step 4: Simplify right side
    21,291.72x = 237,641,355.91
  5. Step 5: Solve for x
    x = 237,641,355.91/21,291.72
  6. Step 6: Final answer
    x = 11,161.21

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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.