Home / 31,071.38-42,864.86-20,996.15

Finding the Fourth Proportional to 31,071.38, 42,864.86 and 20,996.15

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Solution

The fourth proportional to 31,071.38, 42,864.86 and 20,996.15 is: 28,965.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,071.38 : 42,864.86 = 20,996.15 : x
  2. Step 2: Convert to fraction form
    31,071.38/42,864.86 = 20,996.15/x
  3. Step 3: Cross multiply
    31,071.38x = 42,864.86 × 20,996.15
  4. Step 4: Simplify right side
    31,071.38x = 899,997,030.29
  5. Step 5: Solve for x
    x = 899,997,030.29/31,071.38
  6. Step 6: Final answer
    x = 28,965.47

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Half scale
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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.