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Finding the Fourth Proportional to 865.90, 1,298.19 and 433.36

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Solution

The fourth proportional to 865.90, 1,298.19 and 433.36 is: 649.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.90 : 1,298.19 = 433.36 : x
  2. Step 2: Convert to fraction form
    865.90/1,298.19 = 433.36/x
  3. Step 3: Cross multiply
    865.90x = 1,298.19 × 433.36
  4. Step 4: Simplify right side
    865.90x = 562,583.62
  5. Step 5: Solve for x
    x = 562,583.62/865.90
  6. Step 6: Final answer
    x = 649.71

Related Problems

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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.