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Finding the Fourth Proportional to 987, 1,479.25 and 523.63

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Solution

The fourth proportional to 987, 1,479.25 and 523.63 is: 784.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    987 : 1,479.25 = 523.63 : x
  2. Step 2: Convert to fraction form
    987/1,479.25 = 523.63/x
  3. Step 3: Cross multiply
    987x = 1,479.25 × 523.63
  4. Step 4: Simplify right side
    987x = 774,579.68
  5. Step 5: Solve for x
    x = 774,579.68/987
  6. Step 6: Final answer
    x = 784.78

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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.