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Finding the Fourth Proportional to 72.07, 107.57 and 64.45

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Solution

The fourth proportional to 72.07, 107.57 and 64.45 is: 96.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.07 : 107.57 = 64.45 : x
  2. Step 2: Convert to fraction form
    72.07/107.57 = 64.45/x
  3. Step 3: Cross multiply
    72.07x = 107.57 × 64.45
  4. Step 4: Simplify right side
    72.07x = 6,932.89
  5. Step 5: Solve for x
    x = 6,932.89/72.07
  6. Step 6: Final answer
    x = 96.20

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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.