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Finding the Fourth Proportional to 58.86, 81.21 and 51.07

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Solution

The fourth proportional to 58.86, 81.21 and 51.07 is: 70.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.86 : 81.21 = 51.07 : x
  2. Step 2: Convert to fraction form
    58.86/81.21 = 51.07/x
  3. Step 3: Cross multiply
    58.86x = 81.21 × 51.07
  4. Step 4: Simplify right side
    58.86x = 4,147.14
  5. Step 5: Solve for x
    x = 4,147.14/58.86
  6. Step 6: Final answer
    x = 70.46

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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.