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Finding the Fourth Proportional to 70.93, 97.77 and 64.72

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Solution

The fourth proportional to 70.93, 97.77 and 64.72 is: 89.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.93 : 97.77 = 64.72 : x
  2. Step 2: Convert to fraction form
    70.93/97.77 = 64.72/x
  3. Step 3: Cross multiply
    70.93x = 97.77 × 64.72
  4. Step 4: Simplify right side
    70.93x = 6,327.67
  5. Step 5: Solve for x
    x = 6,327.67/70.93
  6. Step 6: Final answer
    x = 89.21

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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.