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Finding the Fourth Proportional to 917.68, 1,266.62 and 630.94

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Solution

The fourth proportional to 917.68, 1,266.62 and 630.94 is: 870.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.68 : 1,266.62 = 630.94 : x
  2. Step 2: Convert to fraction form
    917.68/1,266.62 = 630.94/x
  3. Step 3: Cross multiply
    917.68x = 1,266.62 × 630.94
  4. Step 4: Simplify right side
    917.68x = 799,161.22
  5. Step 5: Solve for x
    x = 799,161.22/917.68
  6. Step 6: Final answer
    x = 870.85

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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.