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Finding the Fourth Proportional to 145.02, 218.77 and 139.36

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Solution

The fourth proportional to 145.02, 218.77 and 139.36 is: 210.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.02 : 218.77 = 139.36 : x
  2. Step 2: Convert to fraction form
    145.02/218.77 = 139.36/x
  3. Step 3: Cross multiply
    145.02x = 218.77 × 139.36
  4. Step 4: Simplify right side
    145.02x = 30,487.79
  5. Step 5: Solve for x
    x = 30,487.79/145.02
  6. Step 6: Final answer
    x = 210.23

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.