Home / 21,001.78-31,502.67-12,230.55

Finding the Fourth Proportional to 21,001.78, 31,502.67 and 12,230.55

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Solution

The fourth proportional to 21,001.78, 31,502.67 and 12,230.55 is: 18,345.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,001.78 : 31,502.67 = 12,230.55 : x
  2. Step 2: Convert to fraction form
    21,001.78/31,502.67 = 12,230.55/x
  3. Step 3: Cross multiply
    21,001.78x = 31,502.67 × 12,230.55
  4. Step 4: Simplify right side
    21,001.78x = 385,294,908.30
  5. Step 5: Solve for x
    x = 385,294,908.30/21,001.78
  6. Step 6: Final answer
    x = 18,345.82

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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.