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Finding the Fourth Proportional to 1,613.16, 2,419.86 and 638.76

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Solution

The fourth proportional to 1,613.16, 2,419.86 and 638.76 is: 958.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,613.16 : 2,419.86 = 638.76 : x
  2. Step 2: Convert to fraction form
    1,613.16/2,419.86 = 638.76/x
  3. Step 3: Cross multiply
    1,613.16x = 2,419.86 × 638.76
  4. Step 4: Simplify right side
    1,613.16x = 1,545,709.77
  5. Step 5: Solve for x
    x = 1,545,709.77/1,613.16
  6. Step 6: Final answer
    x = 958.19

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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.