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Finding the Fourth Proportional to 687.61, 1,030.62 and 297.43

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Solution

The fourth proportional to 687.61, 1,030.62 and 297.43 is: 445.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.61 : 1,030.62 = 297.43 : x
  2. Step 2: Convert to fraction form
    687.61/1,030.62 = 297.43/x
  3. Step 3: Cross multiply
    687.61x = 1,030.62 × 297.43
  4. Step 4: Simplify right side
    687.61x = 306,537.31
  5. Step 5: Solve for x
    x = 306,537.31/687.61
  6. Step 6: Final answer
    x = 445.80

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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.