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Finding the Fourth Proportional to 763.21, 1,053.23 and 413.89

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Solution

The fourth proportional to 763.21, 1,053.23 and 413.89 is: 571.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.21 : 1,053.23 = 413.89 : x
  2. Step 2: Convert to fraction form
    763.21/1,053.23 = 413.89/x
  3. Step 3: Cross multiply
    763.21x = 1,053.23 × 413.89
  4. Step 4: Simplify right side
    763.21x = 435,919.30
  5. Step 5: Solve for x
    x = 435,919.30/763.21
  6. Step 6: Final answer
    x = 571.17

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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.