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Finding the Fourth Proportional to 64.98, 88.86 and 64.04

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Solution

The fourth proportional to 64.98, 88.86 and 64.04 is: 87.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.98 : 88.86 = 64.04 : x
  2. Step 2: Convert to fraction form
    64.98/88.86 = 64.04/x
  3. Step 3: Cross multiply
    64.98x = 88.86 × 64.04
  4. Step 4: Simplify right side
    64.98x = 5,690.59
  5. Step 5: Solve for x
    x = 5,690.59/64.98
  6. Step 6: Final answer
    x = 87.57

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.