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Finding the Fourth Proportional to 578.18, 798.45 and 412.40

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Solution

The fourth proportional to 578.18, 798.45 and 412.40 is: 569.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.18 : 798.45 = 412.40 : x
  2. Step 2: Convert to fraction form
    578.18/798.45 = 412.40/x
  3. Step 3: Cross multiply
    578.18x = 798.45 × 412.40
  4. Step 4: Simplify right side
    578.18x = 329,280.78
  5. Step 5: Solve for x
    x = 329,280.78/578.18
  6. Step 6: Final answer
    x = 569.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.