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Finding the Fourth Proportional to 1,391.08, 2,086.62 and 479.08

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Solution

The fourth proportional to 1,391.08, 2,086.62 and 479.08 is: 718.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.08 : 2,086.62 = 479.08 : x
  2. Step 2: Convert to fraction form
    1,391.08/2,086.62 = 479.08/x
  3. Step 3: Cross multiply
    1,391.08x = 2,086.62 × 479.08
  4. Step 4: Simplify right side
    1,391.08x = 999,657.91
  5. Step 5: Solve for x
    x = 999,657.91/1,391.08
  6. Step 6: Final answer
    x = 718.62

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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.