Home / 20,718.60-31,077.90-18,904.20

Finding the Fourth Proportional to 20,718.60, 31,077.90 and 18,904.20

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Solution

The fourth proportional to 20,718.60, 31,077.90 and 18,904.20 is: 28,356.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.60 : 31,077.90 = 18,904.20 : x
  2. Step 2: Convert to fraction form
    20,718.60/31,077.90 = 18,904.20/x
  3. Step 3: Cross multiply
    20,718.60x = 31,077.90 × 18,904.20
  4. Step 4: Simplify right side
    20,718.60x = 587,502,837.18
  5. Step 5: Solve for x
    x = 587,502,837.18/20,718.60
  6. Step 6: Final answer
    x = 28,356.30

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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.