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Finding the Fourth Proportional to 387.72, 581.48 and 357.66

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Solution

The fourth proportional to 387.72, 581.48 and 357.66 is: 536.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.72 : 581.48 = 357.66 : x
  2. Step 2: Convert to fraction form
    387.72/581.48 = 357.66/x
  3. Step 3: Cross multiply
    387.72x = 581.48 × 357.66
  4. Step 4: Simplify right side
    387.72x = 207,972.14
  5. Step 5: Solve for x
    x = 207,972.14/387.72
  6. Step 6: Final answer
    x = 536.40

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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.