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Finding the Fourth Proportional to 917.20, 1,376.40 and 913.84

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Solution

The fourth proportional to 917.20, 1,376.40 and 913.84 is: 1,371.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.20 : 1,376.40 = 913.84 : x
  2. Step 2: Convert to fraction form
    917.20/1,376.40 = 913.84/x
  3. Step 3: Cross multiply
    917.20x = 1,376.40 × 913.84
  4. Step 4: Simplify right side
    917.20x = 1,257,809.38
  5. Step 5: Solve for x
    x = 1,257,809.38/917.20
  6. Step 6: Final answer
    x = 1,371.36

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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.