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Finding the Fourth Proportional to 72.89, 100.57 and 51.07

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Solution

The fourth proportional to 72.89, 100.57 and 51.07 is: 70.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.89 : 100.57 = 51.07 : x
  2. Step 2: Convert to fraction form
    72.89/100.57 = 51.07/x
  3. Step 3: Cross multiply
    72.89x = 100.57 × 51.07
  4. Step 4: Simplify right side
    72.89x = 5,136.11
  5. Step 5: Solve for x
    x = 5,136.11/72.89
  6. Step 6: Final answer
    x = 70.46

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.