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Finding the Fourth Proportional to 56.24, 84.35 and 47.20

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Solution

The fourth proportional to 56.24, 84.35 and 47.20 is: 70.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.24 : 84.35 = 47.20 : x
  2. Step 2: Convert to fraction form
    56.24/84.35 = 47.20/x
  3. Step 3: Cross multiply
    56.24x = 84.35 × 47.20
  4. Step 4: Simplify right side
    56.24x = 3,981.32
  5. Step 5: Solve for x
    x = 3,981.32/56.24
  6. Step 6: Final answer
    x = 70.80

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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.