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Finding the Fourth Proportional to 687.73, 1,030.29 and 413.02

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Solution

The fourth proportional to 687.73, 1,030.29 and 413.02 is: 618.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.73 : 1,030.29 = 413.02 : x
  2. Step 2: Convert to fraction form
    687.73/1,030.29 = 413.02/x
  3. Step 3: Cross multiply
    687.73x = 1,030.29 × 413.02
  4. Step 4: Simplify right side
    687.73x = 425,530.38
  5. Step 5: Solve for x
    x = 425,530.38/687.73
  6. Step 6: Final answer
    x = 618.75

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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.