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Finding the Fourth Proportional to 145.60, 218.39 and 42.89

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Solution

The fourth proportional to 145.60, 218.39 and 42.89 is: 64.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.60 : 218.39 = 42.89 : x
  2. Step 2: Convert to fraction form
    145.60/218.39 = 42.89/x
  3. Step 3: Cross multiply
    145.60x = 218.39 × 42.89
  4. Step 4: Simplify right side
    145.60x = 9,365.76
  5. Step 5: Solve for x
    x = 9,365.76/145.60
  6. Step 6: Final answer
    x = 64.33

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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.