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Finding the Fourth Proportional to 660.15, 987.26 and 587.45

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Solution

The fourth proportional to 660.15, 987.26 and 587.45 is: 878.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.15 : 987.26 = 587.45 : x
  2. Step 2: Convert to fraction form
    660.15/987.26 = 587.45/x
  3. Step 3: Cross multiply
    660.15x = 987.26 × 587.45
  4. Step 4: Simplify right side
    660.15x = 579,965.42
  5. Step 5: Solve for x
    x = 579,965.42/660.15
  6. Step 6: Final answer
    x = 878.54

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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.