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Finding the Fourth Proportional to 1,391.64, 2,088.17 and 612.18

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Solution

The fourth proportional to 1,391.64, 2,088.17 and 612.18 is: 918.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.64 : 2,088.17 = 612.18 : x
  2. Step 2: Convert to fraction form
    1,391.64/2,088.17 = 612.18/x
  3. Step 3: Cross multiply
    1,391.64x = 2,088.17 × 612.18
  4. Step 4: Simplify right side
    1,391.64x = 1,278,335.15
  5. Step 5: Solve for x
    x = 1,278,335.15/1,391.64
  6. Step 6: Final answer
    x = 918.58

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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.