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Finding the Fourth Proportional to 866.60, 1,298.51 and 519.10

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Solution

The fourth proportional to 866.60, 1,298.51 and 519.10 is: 777.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.60 : 1,298.51 = 519.10 : x
  2. Step 2: Convert to fraction form
    866.60/1,298.51 = 519.10/x
  3. Step 3: Cross multiply
    866.60x = 1,298.51 × 519.10
  4. Step 4: Simplify right side
    866.60x = 674,056.54
  5. Step 5: Solve for x
    x = 674,056.54/866.60
  6. Step 6: Final answer
    x = 777.82

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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.