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Finding the Fourth Proportional to 917.34, 1,264.95 and 693.18

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Solution

The fourth proportional to 917.34, 1,264.95 and 693.18 is: 955.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.34 : 1,264.95 = 693.18 : x
  2. Step 2: Convert to fraction form
    917.34/1,264.95 = 693.18/x
  3. Step 3: Cross multiply
    917.34x = 1,264.95 × 693.18
  4. Step 4: Simplify right side
    917.34x = 876,838.04
  5. Step 5: Solve for x
    x = 876,838.04/917.34
  6. Step 6: Final answer
    x = 955.85

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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.