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Finding the Fourth Proportional to 687.15, 1,030.73 and 444.76

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Solution

The fourth proportional to 687.15, 1,030.73 and 444.76 is: 667.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.15 : 1,030.73 = 444.76 : x
  2. Step 2: Convert to fraction form
    687.15/1,030.73 = 444.76/x
  3. Step 3: Cross multiply
    687.15x = 1,030.73 × 444.76
  4. Step 4: Simplify right side
    687.15x = 458,422.67
  5. Step 5: Solve for x
    x = 458,422.67/687.15
  6. Step 6: Final answer
    x = 667.14

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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.