Home / 31,001.68-42,778.44-20,951.98

Finding the Fourth Proportional to 31,001.68, 42,778.44 and 20,951.98

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Solution

The fourth proportional to 31,001.68, 42,778.44 and 20,951.98 is: 28,911.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,001.68 : 42,778.44 = 20,951.98 : x
  2. Step 2: Convert to fraction form
    31,001.68/42,778.44 = 20,951.98/x
  3. Step 3: Cross multiply
    31,001.68x = 42,778.44 × 20,951.98
  4. Step 4: Simplify right side
    31,001.68x = 896,293,019.31
  5. Step 5: Solve for x
    x = 896,293,019.31/31,001.68
  6. Step 6: Final answer
    x = 28,911.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.