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Finding the Fourth Proportional to 659.02, 987.72 and 578.02

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Solution

The fourth proportional to 659.02, 987.72 and 578.02 is: 866.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.02 : 987.72 = 578.02 : x
  2. Step 2: Convert to fraction form
    659.02/987.72 = 578.02/x
  3. Step 3: Cross multiply
    659.02x = 987.72 × 578.02
  4. Step 4: Simplify right side
    659.02x = 570,921.91
  5. Step 5: Solve for x
    x = 570,921.91/659.02
  6. Step 6: Final answer
    x = 866.32

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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.