Home / 1,413.12-2,119.32-547.20

Finding the Fourth Proportional to 1,413.12, 2,119.32 and 547.20

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Solution

The fourth proportional to 1,413.12, 2,119.32 and 547.20 is: 820.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,413.12 : 2,119.32 = 547.20 : x
  2. Step 2: Convert to fraction form
    1,413.12/2,119.32 = 547.20/x
  3. Step 3: Cross multiply
    1,413.12x = 2,119.32 × 547.20
  4. Step 4: Simplify right side
    1,413.12x = 1,159,691.90
  5. Step 5: Solve for x
    x = 1,159,691.90/1,413.12
  6. Step 6: Final answer
    x = 820.66

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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.