Home / 28,239.60-42,359.40-8,521.20

Finding the Fourth Proportional to 28,239.60, 42,359.40 and 8,521.20

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Solution

The fourth proportional to 28,239.60, 42,359.40 and 8,521.20 is: 12,781.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,239.60 : 42,359.40 = 8,521.20 : x
  2. Step 2: Convert to fraction form
    28,239.60/42,359.40 = 8,521.20/x
  3. Step 3: Cross multiply
    28,239.60x = 42,359.40 × 8,521.20
  4. Step 4: Simplify right side
    28,239.60x = 360,952,919.28
  5. Step 5: Solve for x
    x = 360,952,919.28/28,239.60
  6. Step 6: Final answer
    x = 12,781.80

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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.