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Finding the Fourth Proportional to 923.56, 1,272.90 and 690.28

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Solution

The fourth proportional to 923.56, 1,272.90 and 690.28 is: 951.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.56 : 1,272.90 = 690.28 : x
  2. Step 2: Convert to fraction form
    923.56/1,272.90 = 690.28/x
  3. Step 3: Cross multiply
    923.56x = 1,272.90 × 690.28
  4. Step 4: Simplify right side
    923.56x = 878,657.41
  5. Step 5: Solve for x
    x = 878,657.41/923.56
  6. Step 6: Final answer
    x = 951.38

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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.