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Finding the Fourth Proportional to 66.51, 99.58 and 47.18

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Solution

The fourth proportional to 66.51, 99.58 and 47.18 is: 70.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.51 : 99.58 = 47.18 : x
  2. Step 2: Convert to fraction form
    66.51/99.58 = 47.18/x
  3. Step 3: Cross multiply
    66.51x = 99.58 × 47.18
  4. Step 4: Simplify right side
    66.51x = 4,698.18
  5. Step 5: Solve for x
    x = 4,698.18/66.51
  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.