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Finding the Fourth Proportional to 763.30, 1,053.35 and 413.99

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Solution

The fourth proportional to 763.30, 1,053.35 and 413.99 is: 571.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.30 : 1,053.35 = 413.99 : x
  2. Step 2: Convert to fraction form
    763.30/1,053.35 = 413.99/x
  3. Step 3: Cross multiply
    763.30x = 1,053.35 × 413.99
  4. Step 4: Simplify right side
    763.30x = 436,075.29
  5. Step 5: Solve for x
    x = 436,075.29/763.30
  6. Step 6: Final answer
    x = 571.30

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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.