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Finding the Fourth Proportional to 53.99, 80.62 and 47.15

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Solution

The fourth proportional to 53.99, 80.62 and 47.15 is: 70.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.99 : 80.62 = 47.15 : x
  2. Step 2: Convert to fraction form
    53.99/80.62 = 47.15/x
  3. Step 3: Cross multiply
    53.99x = 80.62 × 47.15
  4. Step 4: Simplify right side
    53.99x = 3,800.71
  5. Step 5: Solve for x
    x = 3,800.71/53.99
  6. Step 6: Final answer
    x = 70.40

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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.