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Finding the Fourth Proportional to 142.90, 214.30 and 46.69

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Solution

The fourth proportional to 142.90, 214.30 and 46.69 is: 70.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.90 : 214.30 = 46.69 : x
  2. Step 2: Convert to fraction form
    142.90/214.30 = 46.69/x
  3. Step 3: Cross multiply
    142.90x = 214.30 × 46.69
  4. Step 4: Simplify right side
    142.90x = 10,005.19
  5. Step 5: Solve for x
    x = 10,005.19/142.90
  6. Step 6: Final answer
    x = 70.02

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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.