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Finding the Fourth Proportional to 923.78, 1,273.36 and 687.35

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Solution

The fourth proportional to 923.78, 1,273.36 and 687.35 is: 947.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.78 : 1,273.36 = 687.35 : x
  2. Step 2: Convert to fraction form
    923.78/1,273.36 = 687.35/x
  3. Step 3: Cross multiply
    923.78x = 1,273.36 × 687.35
  4. Step 4: Simplify right side
    923.78x = 875,240.41
  5. Step 5: Solve for x
    x = 875,240.41/923.78
  6. Step 6: Final answer
    x = 947.46

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Double scale
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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.