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Finding the Fourth Proportional to 763.48, 1,145.22 and 307.48

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Solution

The fourth proportional to 763.48, 1,145.22 and 307.48 is: 461.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.48 : 1,145.22 = 307.48 : x
  2. Step 2: Convert to fraction form
    763.48/1,145.22 = 307.48/x
  3. Step 3: Cross multiply
    763.48x = 1,145.22 × 307.48
  4. Step 4: Simplify right side
    763.48x = 352,132.25
  5. Step 5: Solve for x
    x = 352,132.25/763.48
  6. Step 6: Final answer
    x = 461.22

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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.