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Finding the Fourth Proportional to 58.31, 86.90 and 56.64

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Solution

The fourth proportional to 58.31, 86.90 and 56.64 is: 84.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.31 : 86.90 = 56.64 : x
  2. Step 2: Convert to fraction form
    58.31/86.90 = 56.64/x
  3. Step 3: Cross multiply
    58.31x = 86.90 × 56.64
  4. Step 4: Simplify right side
    58.31x = 4,922.02
  5. Step 5: Solve for x
    x = 4,922.02/58.31
  6. Step 6: Final answer
    x = 84.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.