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Finding the Fourth Proportional to 260.68, 390.68 and 145.02

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Solution

The fourth proportional to 260.68, 390.68 and 145.02 is: 217.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.68 : 390.68 = 145.02 : x
  2. Step 2: Convert to fraction form
    260.68/390.68 = 145.02/x
  3. Step 3: Cross multiply
    260.68x = 390.68 × 145.02
  4. Step 4: Simplify right side
    260.68x = 56,656.41
  5. Step 5: Solve for x
    x = 56,656.41/260.68
  6. Step 6: Final answer
    x = 217.34

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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.