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Finding the Fourth Proportional to 923.75, 1,275.36 and 687.44

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Solution

The fourth proportional to 923.75, 1,275.36 and 687.44 is: 949.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.75 : 1,275.36 = 687.44 : x
  2. Step 2: Convert to fraction form
    923.75/1,275.36 = 687.44/x
  3. Step 3: Cross multiply
    923.75x = 1,275.36 × 687.44
  4. Step 4: Simplify right side
    923.75x = 876,730.78
  5. Step 5: Solve for x
    x = 876,730.78/923.75
  6. Step 6: Final answer
    x = 949.10

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1.5x scale

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.