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Finding the Fourth Proportional to 387.18, 577.13 and 370.78

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Solution

The fourth proportional to 387.18, 577.13 and 370.78 is: 552.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.18 : 577.13 = 370.78 : x
  2. Step 2: Convert to fraction form
    387.18/577.13 = 370.78/x
  3. Step 3: Cross multiply
    387.18x = 577.13 × 370.78
  4. Step 4: Simplify right side
    387.18x = 213,984.96
  5. Step 5: Solve for x
    x = 213,984.96/387.18
  6. Step 6: Final answer
    x = 552.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.