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Finding the Fourth Proportional to 763.12, 1,143.64 and 397.16

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Solution

The fourth proportional to 763.12, 1,143.64 and 397.16 is: 595.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.12 : 1,143.64 = 397.16 : x
  2. Step 2: Convert to fraction form
    763.12/1,143.64 = 397.16/x
  3. Step 3: Cross multiply
    763.12x = 1,143.64 × 397.16
  4. Step 4: Simplify right side
    763.12x = 454,208.06
  5. Step 5: Solve for x
    x = 454,208.06/763.12
  6. Step 6: Final answer
    x = 595.20

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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.