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Finding the Fourth Proportional to 578.16, 864.72 and 385.92

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Solution

The fourth proportional to 578.16, 864.72 and 385.92 is: 577.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.16 : 864.72 = 385.92 : x
  2. Step 2: Convert to fraction form
    578.16/864.72 = 385.92/x
  3. Step 3: Cross multiply
    578.16x = 864.72 × 385.92
  4. Step 4: Simplify right side
    578.16x = 333,712.74
  5. Step 5: Solve for x
    x = 333,712.74/578.16
  6. Step 6: Final answer
    x = 577.20

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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.