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Finding the Fourth Proportional to 259.90, 390.04 and 97.72

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Solution

The fourth proportional to 259.90, 390.04 and 97.72 is: 146.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.90 : 390.04 = 97.72 : x
  2. Step 2: Convert to fraction form
    259.90/390.04 = 97.72/x
  3. Step 3: Cross multiply
    259.90x = 390.04 × 97.72
  4. Step 4: Simplify right side
    259.90x = 38,114.71
  5. Step 5: Solve for x
    x = 38,114.71/259.90
  6. Step 6: Final answer
    x = 146.65

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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.