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Finding the Fourth Proportional to 754.34, 1,124.98 and 645.35

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Solution

The fourth proportional to 754.34, 1,124.98 and 645.35 is: 962.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.34 : 1,124.98 = 645.35 : x
  2. Step 2: Convert to fraction form
    754.34/1,124.98 = 645.35/x
  3. Step 3: Cross multiply
    754.34x = 1,124.98 × 645.35
  4. Step 4: Simplify right side
    754.34x = 725,998.60
  5. Step 5: Solve for x
    x = 725,998.60/754.34
  6. Step 6: Final answer
    x = 962.44

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.