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Finding the Fourth Proportional to 65.61, 90.51 and 43.79

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Solution

The fourth proportional to 65.61, 90.51 and 43.79 is: 60.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.61 : 90.51 = 43.79 : x
  2. Step 2: Convert to fraction form
    65.61/90.51 = 43.79/x
  3. Step 3: Cross multiply
    65.61x = 90.51 × 43.79
  4. Step 4: Simplify right side
    65.61x = 3,962.98
  5. Step 5: Solve for x
    x = 3,962.98/65.61
  6. Step 6: Final answer
    x = 60.40

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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.