Home / 28,215.40-42,309.42-8,490.28

Finding the Fourth Proportional to 28,215.40, 42,309.42 and 8,490.28

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Solution

The fourth proportional to 28,215.40, 42,309.42 and 8,490.28 is: 12,731.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,215.40 : 42,309.42 = 8,490.28 : x
  2. Step 2: Convert to fraction form
    28,215.40/42,309.42 = 8,490.28/x
  3. Step 3: Cross multiply
    28,215.40x = 42,309.42 × 8,490.28
  4. Step 4: Simplify right side
    28,215.40x = 359,218,822.44
  5. Step 5: Solve for x
    x = 359,218,822.44/28,215.40
  6. Step 6: Final answer
    x = 12,731.30

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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.