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Finding the Fourth Proportional to 627.12, 865.48 and 378.48

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Solution

The fourth proportional to 627.12, 865.48 and 378.48 is: 522.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.12 : 865.48 = 378.48 : x
  2. Step 2: Convert to fraction form
    627.12/865.48 = 378.48/x
  3. Step 3: Cross multiply
    627.12x = 865.48 × 378.48
  4. Step 4: Simplify right side
    627.12x = 327,566.87
  5. Step 5: Solve for x
    x = 327,566.87/627.12
  6. Step 6: Final answer
    x = 522.34

Related Problems

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Half scale
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Double scale
Find fourth proportional to 628.12, 866.86 and 379.48
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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.