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Finding the Fourth Proportional to 763.49, 1,145.39 and 398.18

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Solution

The fourth proportional to 763.49, 1,145.39 and 398.18 is: 597.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.49 : 1,145.39 = 398.18 : x
  2. Step 2: Convert to fraction form
    763.49/1,145.39 = 398.18/x
  3. Step 3: Cross multiply
    763.49x = 1,145.39 × 398.18
  4. Step 4: Simplify right side
    763.49x = 456,063.67
  5. Step 5: Solve for x
    x = 456,063.67/763.49
  6. Step 6: Final answer
    x = 597.34

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1.5x scale

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.