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Finding the Fourth Proportional to 85.88, 128.64 and 58.88

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Solution

The fourth proportional to 85.88, 128.64 and 58.88 is: 88.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.88 : 128.64 = 58.88 : x
  2. Step 2: Convert to fraction form
    85.88/128.64 = 58.88/x
  3. Step 3: Cross multiply
    85.88x = 128.64 × 58.88
  4. Step 4: Simplify right side
    85.88x = 7,574.32
  5. Step 5: Solve for x
    x = 7,574.32/85.88
  6. Step 6: Final answer
    x = 88.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.