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Finding the Fourth Proportional to 28,959.20, 43,438.80 and 28,521.80

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Solution

The fourth proportional to 28,959.20, 43,438.80 and 28,521.80 is: 42,782.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,959.20 : 43,438.80 = 28,521.80 : x
  2. Step 2: Convert to fraction form
    28,959.20/43,438.80 = 28,521.80/x
  3. Step 3: Cross multiply
    28,959.20x = 43,438.80 × 28,521.80
  4. Step 4: Simplify right side
    28,959.20x = 1,238,952,765.84
  5. Step 5: Solve for x
    x = 1,238,952,765.84/28,959.20
  6. Step 6: Final answer
    x = 42,782.70

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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.