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Finding the Fourth Proportional to 1,398.77, 2,098.15 and 425.15

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Solution

The fourth proportional to 1,398.77, 2,098.15 and 425.15 is: 637.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.77 : 2,098.15 = 425.15 : x
  2. Step 2: Convert to fraction form
    1,398.77/2,098.15 = 425.15/x
  3. Step 3: Cross multiply
    1,398.77x = 2,098.15 × 425.15
  4. Step 4: Simplify right side
    1,398.77x = 892,015.86
  5. Step 5: Solve for x
    x = 892,015.86/1,398.77
  6. Step 6: Final answer
    x = 637.72

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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.