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Finding the Fourth Proportional to 917.17, 1,264.74 and 637.72

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Solution

The fourth proportional to 917.17, 1,264.74 and 637.72 is: 879.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.17 : 1,264.74 = 637.72 : x
  2. Step 2: Convert to fraction form
    917.17/1,264.74 = 637.72/x
  3. Step 3: Cross multiply
    917.17x = 1,264.74 × 637.72
  4. Step 4: Simplify right side
    917.17x = 806,549.99
  5. Step 5: Solve for x
    x = 806,549.99/917.17
  6. Step 6: Final answer
    x = 879.39

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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.