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Finding the Fourth Proportional to 865.64, 1,298.46 and 288.50

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Solution

The fourth proportional to 865.64, 1,298.46 and 288.50 is: 432.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.64 : 1,298.46 = 288.50 : x
  2. Step 2: Convert to fraction form
    865.64/1,298.46 = 288.50/x
  3. Step 3: Cross multiply
    865.64x = 1,298.46 × 288.50
  4. Step 4: Simplify right side
    865.64x = 374,605.71
  5. Step 5: Solve for x
    x = 374,605.71/865.64
  6. Step 6: Final answer
    x = 432.75

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Double scale
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Similar ratio
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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.