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Finding the Fourth Proportional to 763.12, 1,053.60 and 553.98

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Solution

The fourth proportional to 763.12, 1,053.60 and 553.98 is: 764.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.12 : 1,053.60 = 553.98 : x
  2. Step 2: Convert to fraction form
    763.12/1,053.60 = 553.98/x
  3. Step 3: Cross multiply
    763.12x = 1,053.60 × 553.98
  4. Step 4: Simplify right side
    763.12x = 583,673.33
  5. Step 5: Solve for x
    x = 583,673.33/763.12
  6. Step 6: Final answer
    x = 764.85

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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.