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Finding the Fourth Proportional to 58.48, 80.70 and 40.09

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Solution

The fourth proportional to 58.48, 80.70 and 40.09 is: 55.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.48 : 80.70 = 40.09 : x
  2. Step 2: Convert to fraction form
    58.48/80.70 = 40.09/x
  3. Step 3: Cross multiply
    58.48x = 80.70 × 40.09
  4. Step 4: Simplify right side
    58.48x = 3,235.26
  5. Step 5: Solve for x
    x = 3,235.26/58.48
  6. Step 6: Final answer
    x = 55.32

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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.