Home / 31,088.74-42,909.09-20,479.30

Finding the Fourth Proportional to 31,088.74, 42,909.09 and 20,479.30

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Solution

The fourth proportional to 31,088.74, 42,909.09 and 20,479.30 is: 28,265.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,088.74 : 42,909.09 = 20,479.30 : x
  2. Step 2: Convert to fraction form
    31,088.74/42,909.09 = 20,479.30/x
  3. Step 3: Cross multiply
    31,088.74x = 42,909.09 × 20,479.30
  4. Step 4: Simplify right side
    31,088.74x = 878,748,126.84
  5. Step 5: Solve for x
    x = 878,748,126.84/31,088.74
  6. Step 6: Final answer
    x = 28,265.80

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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.