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Finding the Fourth Proportional to 697.71, 1,045.81 and 258.55

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Solution

The fourth proportional to 697.71, 1,045.81 and 258.55 is: 387.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.71 : 1,045.81 = 258.55 : x
  2. Step 2: Convert to fraction form
    697.71/1,045.81 = 258.55/x
  3. Step 3: Cross multiply
    697.71x = 1,045.81 × 258.55
  4. Step 4: Simplify right side
    697.71x = 270,394.18
  5. Step 5: Solve for x
    x = 270,394.18/697.71
  6. Step 6: Final answer
    x = 387.55

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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.