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Finding the Fourth Proportional to 385.58, 578.40 and 265.04

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Solution

The fourth proportional to 385.58, 578.40 and 265.04 is: 397.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.58 : 578.40 = 265.04 : x
  2. Step 2: Convert to fraction form
    385.58/578.40 = 265.04/x
  3. Step 3: Cross multiply
    385.58x = 578.40 × 265.04
  4. Step 4: Simplify right side
    385.58x = 153,299.14
  5. Step 5: Solve for x
    x = 153,299.14/385.58
  6. Step 6: Final answer
    x = 397.58

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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.