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Finding the Fourth Proportional to 469.39, 647.75 and 259.57

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Solution

The fourth proportional to 469.39, 647.75 and 259.57 is: 358.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.39 : 647.75 = 259.57 : x
  2. Step 2: Convert to fraction form
    469.39/647.75 = 259.57/x
  3. Step 3: Cross multiply
    469.39x = 647.75 × 259.57
  4. Step 4: Simplify right side
    469.39x = 168,131.93
  5. Step 5: Solve for x
    x = 168,131.93/469.39
  6. Step 6: Final answer
    x = 358.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.