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Finding the Fourth Proportional to 763.04, 1,053.06 and 638.48

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Solution

The fourth proportional to 763.04, 1,053.06 and 638.48 is: 881.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.04 : 1,053.06 = 638.48 : x
  2. Step 2: Convert to fraction form
    763.04/1,053.06 = 638.48/x
  3. Step 3: Cross multiply
    763.04x = 1,053.06 × 638.48
  4. Step 4: Simplify right side
    763.04x = 672,357.75
  5. Step 5: Solve for x
    x = 672,357.75/763.04
  6. Step 6: Final answer
    x = 881.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.