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Finding the Fourth Proportional to 42.07, 58.07 and 30.43

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Solution

The fourth proportional to 42.07, 58.07 and 30.43 is: 42.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.07 : 58.07 = 30.43 : x
  2. Step 2: Convert to fraction form
    42.07/58.07 = 30.43/x
  3. Step 3: Cross multiply
    42.07x = 58.07 × 30.43
  4. Step 4: Simplify right side
    42.07x = 1,767.07
  5. Step 5: Solve for x
    x = 1,767.07/42.07
  6. Step 6: Final answer
    x = 42.00

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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.