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Finding the Fourth Proportional to 65.55, 90.70 and 57.37

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Solution

The fourth proportional to 65.55, 90.70 and 57.37 is: 79.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.55 : 90.70 = 57.37 : x
  2. Step 2: Convert to fraction form
    65.55/90.70 = 57.37/x
  3. Step 3: Cross multiply
    65.55x = 90.70 × 57.37
  4. Step 4: Simplify right side
    65.55x = 5,203.46
  5. Step 5: Solve for x
    x = 5,203.46/65.55
  6. Step 6: Final answer
    x = 79.38

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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.