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Finding the Fourth Proportional to 52.58, 78.72 and 47.18

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Solution

The fourth proportional to 52.58, 78.72 and 47.18 is: 70.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.58 : 78.72 = 47.18 : x
  2. Step 2: Convert to fraction form
    52.58/78.72 = 47.18/x
  3. Step 3: Cross multiply
    52.58x = 78.72 × 47.18
  4. Step 4: Simplify right side
    52.58x = 3,714.01
  5. Step 5: Solve for x
    x = 3,714.01/52.58
  6. Step 6: Final answer
    x = 70.64

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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.