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Finding the Fourth Proportional to 65.58, 90.42 and 51.72

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Solution

The fourth proportional to 65.58, 90.42 and 51.72 is: 71.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.58 : 90.42 = 51.72 : x
  2. Step 2: Convert to fraction form
    65.58/90.42 = 51.72/x
  3. Step 3: Cross multiply
    65.58x = 90.42 × 51.72
  4. Step 4: Simplify right side
    65.58x = 4,676.52
  5. Step 5: Solve for x
    x = 4,676.52/65.58
  6. Step 6: Final answer
    x = 71.31

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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.