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Finding the Fourth Proportional to 58.51, 87.81 and 55.90

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Solution

The fourth proportional to 58.51, 87.81 and 55.90 is: 83.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.51 : 87.81 = 55.90 : x
  2. Step 2: Convert to fraction form
    58.51/87.81 = 55.90/x
  3. Step 3: Cross multiply
    58.51x = 87.81 × 55.90
  4. Step 4: Simplify right side
    58.51x = 4,908.58
  5. Step 5: Solve for x
    x = 4,908.58/58.51
  6. Step 6: Final answer
    x = 83.89

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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.