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Finding the Fourth Proportional to 1,145.34, 1,580.40 and 679.50

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Solution

The fourth proportional to 1,145.34, 1,580.40 and 679.50 is: 937.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.34 : 1,580.40 = 679.50 : x
  2. Step 2: Convert to fraction form
    1,145.34/1,580.40 = 679.50/x
  3. Step 3: Cross multiply
    1,145.34x = 1,580.40 × 679.50
  4. Step 4: Simplify right side
    1,145.34x = 1,073,881.80
  5. Step 5: Solve for x
    x = 1,073,881.80/1,145.34
  6. Step 6: Final answer
    x = 937.61

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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.