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Finding the Fourth Proportional to 1,387.05, 2,080.58 and 413.16

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Solution

The fourth proportional to 1,387.05, 2,080.58 and 413.16 is: 619.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.05 : 2,080.58 = 413.16 : x
  2. Step 2: Convert to fraction form
    1,387.05/2,080.58 = 413.16/x
  3. Step 3: Cross multiply
    1,387.05x = 2,080.58 × 413.16
  4. Step 4: Simplify right side
    1,387.05x = 859,610.37
  5. Step 5: Solve for x
    x = 859,610.37/1,387.05
  6. Step 6: Final answer
    x = 619.74

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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.