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Finding the Fourth Proportional to 1,677.39, 2,515.94 and 689.93

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Solution

The fourth proportional to 1,677.39, 2,515.94 and 689.93 is: 1,034.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,677.39 : 2,515.94 = 689.93 : x
  2. Step 2: Convert to fraction form
    1,677.39/2,515.94 = 689.93/x
  3. Step 3: Cross multiply
    1,677.39x = 2,515.94 × 689.93
  4. Step 4: Simplify right side
    1,677.39x = 1,735,822.48
  5. Step 5: Solve for x
    x = 1,735,822.48/1,677.39
  6. Step 6: Final answer
    x = 1,034.84

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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.