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Finding the Fourth Proportional to 64.58, 89.06 and 42.75

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Solution

The fourth proportional to 64.58, 89.06 and 42.75 is: 58.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.58 : 89.06 = 42.75 : x
  2. Step 2: Convert to fraction form
    64.58/89.06 = 42.75/x
  3. Step 3: Cross multiply
    64.58x = 89.06 × 42.75
  4. Step 4: Simplify right side
    64.58x = 3,807.10
  5. Step 5: Solve for x
    x = 3,807.10/64.58
  6. Step 6: Final answer
    x = 58.96

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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.