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Finding the Fourth Proportional to 387.94, 581.90 and 99.38

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Solution

The fourth proportional to 387.94, 581.90 and 99.38 is: 149.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.94 : 581.90 = 99.38 : x
  2. Step 2: Convert to fraction form
    387.94/581.90 = 99.38/x
  3. Step 3: Cross multiply
    387.94x = 581.90 × 99.38
  4. Step 4: Simplify right side
    387.94x = 57,829.22
  5. Step 5: Solve for x
    x = 57,829.22/387.94
  6. Step 6: Final answer
    x = 149.07

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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.