Home / 13,354.08-18,428.55-7,978.95

Finding the Fourth Proportional to 13,354.08, 18,428.55 and 7,978.95

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Solution

The fourth proportional to 13,354.08, 18,428.55 and 7,978.95 is: 11,010.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,354.08 : 18,428.55 = 7,978.95 : x
  2. Step 2: Convert to fraction form
    13,354.08/18,428.55 = 7,978.95/x
  3. Step 3: Cross multiply
    13,354.08x = 18,428.55 × 7,978.95
  4. Step 4: Simplify right side
    13,354.08x = 147,040,479.02
  5. Step 5: Solve for x
    x = 147,040,479.02/13,354.08
  6. Step 6: Final answer
    x = 11,010.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.