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Finding the Fourth Proportional to 887.31, 1,223.94 and 688.32

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Solution

The fourth proportional to 887.31, 1,223.94 and 688.32 is: 949.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.31 : 1,223.94 = 688.32 : x
  2. Step 2: Convert to fraction form
    887.31/1,223.94 = 688.32/x
  3. Step 3: Cross multiply
    887.31x = 1,223.94 × 688.32
  4. Step 4: Simplify right side
    887.31x = 842,462.38
  5. Step 5: Solve for x
    x = 842,462.38/887.31
  6. Step 6: Final answer
    x = 949.46

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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.