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Finding the Fourth Proportional to 72.36, 99.78 and 53.60

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Solution

The fourth proportional to 72.36, 99.78 and 53.60 is: 73.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.36 : 99.78 = 53.60 : x
  2. Step 2: Convert to fraction form
    72.36/99.78 = 53.60/x
  3. Step 3: Cross multiply
    72.36x = 99.78 × 53.60
  4. Step 4: Simplify right side
    72.36x = 5,348.21
  5. Step 5: Solve for x
    x = 5,348.21/72.36
  6. Step 6: Final answer
    x = 73.91

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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.