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Finding the Fourth Proportional to 64.46, 88.69 and 56.29

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Solution

The fourth proportional to 64.46, 88.69 and 56.29 is: 77.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.46 : 88.69 = 56.29 : x
  2. Step 2: Convert to fraction form
    64.46/88.69 = 56.29/x
  3. Step 3: Cross multiply
    64.46x = 88.69 × 56.29
  4. Step 4: Simplify right side
    64.46x = 4,992.44
  5. Step 5: Solve for x
    x = 4,992.44/64.46
  6. Step 6: Final answer
    x = 77.45

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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.