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Finding the Fourth Proportional to 763.88, 1,145.19 and 653.77

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Solution

The fourth proportional to 763.88, 1,145.19 and 653.77 is: 980.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.88 : 1,145.19 = 653.77 : x
  2. Step 2: Convert to fraction form
    763.88/1,145.19 = 653.77/x
  3. Step 3: Cross multiply
    763.88x = 1,145.19 × 653.77
  4. Step 4: Simplify right side
    763.88x = 748,691.07
  5. Step 5: Solve for x
    x = 748,691.07/763.88
  6. Step 6: Final answer
    x = 980.12

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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.