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Finding the Fourth Proportional to 64.58, 89.18 and 42.76

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Solution

The fourth proportional to 64.58, 89.18 and 42.76 is: 59.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.58 : 89.18 = 42.76 : x
  2. Step 2: Convert to fraction form
    64.58/89.18 = 42.76/x
  3. Step 3: Cross multiply
    64.58x = 89.18 × 42.76
  4. Step 4: Simplify right side
    64.58x = 3,813.34
  5. Step 5: Solve for x
    x = 3,813.34/64.58
  6. Step 6: Final answer
    x = 59.05

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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.