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Finding the Fourth Proportional to 65.21, 97.45 and 53.20

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Solution

The fourth proportional to 65.21, 97.45 and 53.20 is: 79.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.21 : 97.45 = 53.20 : x
  2. Step 2: Convert to fraction form
    65.21/97.45 = 53.20/x
  3. Step 3: Cross multiply
    65.21x = 97.45 × 53.20
  4. Step 4: Simplify right side
    65.21x = 5,184.34
  5. Step 5: Solve for x
    x = 5,184.34/65.21
  6. Step 6: Final answer
    x = 79.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.