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Finding the Fourth Proportional to 866.17, 1,299.39 and 289

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Solution

The fourth proportional to 866.17, 1,299.39 and 289 is: 433.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.17 : 1,299.39 = 289 : x
  2. Step 2: Convert to fraction form
    866.17/1,299.39 = 289/x
  3. Step 3: Cross multiply
    866.17x = 1,299.39 × 289
  4. Step 4: Simplify right side
    866.17x = 375,523.71
  5. Step 5: Solve for x
    x = 375,523.71/866.17
  6. Step 6: Final answer
    x = 433.55

Related Problems

Find fourth proportional to 433.09, 649.70 and 144.50
Half scale
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Double scale
Find fourth proportional to 867.17, 1,300.89 and 290
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.