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Finding the Fourth Proportional to 1,386.40, 2,079.46 and 413.12

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Solution

The fourth proportional to 1,386.40, 2,079.46 and 413.12 is: 619.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.40 : 2,079.46 = 413.12 : x
  2. Step 2: Convert to fraction form
    1,386.40/2,079.46 = 413.12/x
  3. Step 3: Cross multiply
    1,386.40x = 2,079.46 × 413.12
  4. Step 4: Simplify right side
    1,386.40x = 859,066.52
  5. Step 5: Solve for x
    x = 859,066.52/1,386.40
  6. Step 6: Final answer
    x = 619.64

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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.