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Finding the Fourth Proportional to 143.61, 215.36 and 70.47

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Solution

The fourth proportional to 143.61, 215.36 and 70.47 is: 105.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.61 : 215.36 = 70.47 : x
  2. Step 2: Convert to fraction form
    143.61/215.36 = 70.47/x
  3. Step 3: Cross multiply
    143.61x = 215.36 × 70.47
  4. Step 4: Simplify right side
    143.61x = 15,176.07
  5. Step 5: Solve for x
    x = 15,176.07/143.61
  6. Step 6: Final answer
    x = 105.68

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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.