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Finding the Fourth Proportional to 58.79, 80.98 and 55.91

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Solution

The fourth proportional to 58.79, 80.98 and 55.91 is: 77.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.79 : 80.98 = 55.91 : x
  2. Step 2: Convert to fraction form
    58.79/80.98 = 55.91/x
  3. Step 3: Cross multiply
    58.79x = 80.98 × 55.91
  4. Step 4: Simplify right side
    58.79x = 4,527.05
  5. Step 5: Solve for x
    x = 4,527.05/58.79
  6. Step 6: Final answer
    x = 77.01

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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.