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Finding the Fourth Proportional to 763.98, 1,146 and 398.40

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Solution

The fourth proportional to 763.98, 1,146 and 398.40 is: 597.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.98 : 1,146 = 398.40 : x
  2. Step 2: Convert to fraction form
    763.98/1,146 = 398.40/x
  3. Step 3: Cross multiply
    763.98x = 1,146 × 398.40
  4. Step 4: Simplify right side
    763.98x = 456,566.40
  5. Step 5: Solve for x
    x = 456,566.40/763.98
  6. Step 6: Final answer
    x = 597.62

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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.