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Finding the Fourth Proportional to 865.50, 1,298.28 and 288.36

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Solution

The fourth proportional to 865.50, 1,298.28 and 288.36 is: 432.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.50 : 1,298.28 = 288.36 : x
  2. Step 2: Convert to fraction form
    865.50/1,298.28 = 288.36/x
  3. Step 3: Cross multiply
    865.50x = 1,298.28 × 288.36
  4. Step 4: Simplify right side
    865.50x = 374,372.02
  5. Step 5: Solve for x
    x = 374,372.02/865.50
  6. Step 6: Final answer
    x = 432.55

Related Problems

Find fourth proportional to 432.75, 649.14 and 144.18
Half scale
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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.