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Finding the Fourth Proportional to 687.13, 1,030.70 and 174.13

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Solution

The fourth proportional to 687.13, 1,030.70 and 174.13 is: 261.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.13 : 1,030.70 = 174.13 : x
  2. Step 2: Convert to fraction form
    687.13/1,030.70 = 174.13/x
  3. Step 3: Cross multiply
    687.13x = 1,030.70 × 174.13
  4. Step 4: Simplify right side
    687.13x = 179,475.79
  5. Step 5: Solve for x
    x = 179,475.79/687.13
  6. Step 6: Final answer
    x = 261.20

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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.