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Finding the Fourth Proportional to 61.90, 92.59 and 47.30

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Solution

The fourth proportional to 61.90, 92.59 and 47.30 is: 70.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.90 : 92.59 = 47.30 : x
  2. Step 2: Convert to fraction form
    61.90/92.59 = 47.30/x
  3. Step 3: Cross multiply
    61.90x = 92.59 × 47.30
  4. Step 4: Simplify right side
    61.90x = 4,378.93
  5. Step 5: Solve for x
    x = 4,378.93/61.90
  6. Step 6: Final answer
    x = 70.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.