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Finding the Fourth Proportional to 690.18, 1,034.91 and 257.46

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Solution

The fourth proportional to 690.18, 1,034.91 and 257.46 is: 386.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.18 : 1,034.91 = 257.46 : x
  2. Step 2: Convert to fraction form
    690.18/1,034.91 = 257.46/x
  3. Step 3: Cross multiply
    690.18x = 1,034.91 × 257.46
  4. Step 4: Simplify right side
    690.18x = 266,447.93
  5. Step 5: Solve for x
    x = 266,447.93/690.18
  6. Step 6: Final answer
    x = 386.06

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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.