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Finding the Fourth Proportional to 917.49, 1,375.14 and 429.60

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Solution

The fourth proportional to 917.49, 1,375.14 and 429.60 is: 643.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.49 : 1,375.14 = 429.60 : x
  2. Step 2: Convert to fraction form
    917.49/1,375.14 = 429.60/x
  3. Step 3: Cross multiply
    917.49x = 1,375.14 × 429.60
  4. Step 4: Simplify right side
    917.49x = 590,760.14
  5. Step 5: Solve for x
    x = 590,760.14/917.49
  6. Step 6: Final answer
    x = 643.89

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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.