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Finding the Fourth Proportional to 58.72, 87.90 and 57.90

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Solution

The fourth proportional to 58.72, 87.90 and 57.90 is: 86.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.72 : 87.90 = 57.90 : x
  2. Step 2: Convert to fraction form
    58.72/87.90 = 57.90/x
  3. Step 3: Cross multiply
    58.72x = 87.90 × 57.90
  4. Step 4: Simplify right side
    58.72x = 5,089.41
  5. Step 5: Solve for x
    x = 5,089.41/58.72
  6. Step 6: Final answer
    x = 86.67

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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.