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Finding the Fourth Proportional to 82.12, 122.69 and 53.00

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Solution

The fourth proportional to 82.12, 122.69 and 53.00 is: 79.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.12 : 122.69 = 53.00 : x
  2. Step 2: Convert to fraction form
    82.12/122.69 = 53.00/x
  3. Step 3: Cross multiply
    82.12x = 122.69 × 53.00
  4. Step 4: Simplify right side
    82.12x = 6,501.83
  5. Step 5: Solve for x
    x = 6,501.83/82.12
  6. Step 6: Final answer
    x = 79.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.