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Finding the Fourth Proportional to 917.68, 1,376.34 and 430.96

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Solution

The fourth proportional to 917.68, 1,376.34 and 430.96 is: 646.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.68 : 1,376.34 = 430.96 : x
  2. Step 2: Convert to fraction form
    917.68/1,376.34 = 430.96/x
  3. Step 3: Cross multiply
    917.68x = 1,376.34 × 430.96
  4. Step 4: Simplify right side
    917.68x = 593,147.49
  5. Step 5: Solve for x
    x = 593,147.49/917.68
  6. Step 6: Final answer
    x = 646.36

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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.