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Finding the Fourth Proportional to 865.76, 1,298.97 and 378.88

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Solution

The fourth proportional to 865.76, 1,298.97 and 378.88 is: 568.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.76 : 1,298.97 = 378.88 : x
  2. Step 2: Convert to fraction form
    865.76/1,298.97 = 378.88/x
  3. Step 3: Cross multiply
    865.76x = 1,298.97 × 378.88
  4. Step 4: Simplify right side
    865.76x = 492,150.51
  5. Step 5: Solve for x
    x = 492,150.51/865.76
  6. Step 6: Final answer
    x = 568.46

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.