Home / 28,138.78-42,210.40-9,418.91

Finding the Fourth Proportional to 28,138.78, 42,210.40 and 9,418.91

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Solution

The fourth proportional to 28,138.78, 42,210.40 and 9,418.91 is: 14,129.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,138.78 : 42,210.40 = 9,418.91 : x
  2. Step 2: Convert to fraction form
    28,138.78/42,210.40 = 9,418.91/x
  3. Step 3: Cross multiply
    28,138.78x = 42,210.40 × 9,418.91
  4. Step 4: Simplify right side
    28,138.78x = 397,575,958.66
  5. Step 5: Solve for x
    x = 397,575,958.66/28,138.78
  6. Step 6: Final answer
    x = 14,129.11

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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.