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Finding the Fourth Proportional to 913.56, 1,369.08 and 718.80

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Solution

The fourth proportional to 913.56, 1,369.08 and 718.80 is: 1,077.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.56 : 1,369.08 = 718.80 : x
  2. Step 2: Convert to fraction form
    913.56/1,369.08 = 718.80/x
  3. Step 3: Cross multiply
    913.56x = 1,369.08 × 718.80
  4. Step 4: Simplify right side
    913.56x = 984,094.70
  5. Step 5: Solve for x
    x = 984,094.70/913.56
  6. Step 6: Final answer
    x = 1,077.21

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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.