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Finding the Fourth Proportional to 28,005.40, 42,008.10 and 25,240.60

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Solution

The fourth proportional to 28,005.40, 42,008.10 and 25,240.60 is: 37,860.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,005.40 : 42,008.10 = 25,240.60 : x
  2. Step 2: Convert to fraction form
    28,005.40/42,008.10 = 25,240.60/x
  3. Step 3: Cross multiply
    28,005.40x = 42,008.10 × 25,240.60
  4. Step 4: Simplify right side
    28,005.40x = 1,060,309,648.86
  5. Step 5: Solve for x
    x = 1,060,309,648.86/28,005.40
  6. Step 6: Final answer
    x = 37,860.90

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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.