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Finding the Fourth Proportional to 627.57, 865.62 and 378.72

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Solution

The fourth proportional to 627.57, 865.62 and 378.72 is: 522.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.57 : 865.62 = 378.72 : x
  2. Step 2: Convert to fraction form
    627.57/865.62 = 378.72/x
  3. Step 3: Cross multiply
    627.57x = 865.62 × 378.72
  4. Step 4: Simplify right side
    627.57x = 327,827.61
  5. Step 5: Solve for x
    x = 327,827.61/627.57
  6. Step 6: Final answer
    x = 522.38

Related Problems

Find fourth proportional to 313.79, 432.81 and 189.36
Half scale
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Double scale
Find fourth proportional to 628.57, 867 and 379.72
Similar ratio
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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.