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Finding the Fourth Proportional to 469.39, 647.76 and 259.58

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Solution

The fourth proportional to 469.39, 647.76 and 259.58 is: 358.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.39 : 647.76 = 259.58 : x
  2. Step 2: Convert to fraction form
    469.39/647.76 = 259.58/x
  3. Step 3: Cross multiply
    469.39x = 647.76 × 259.58
  4. Step 4: Simplify right side
    469.39x = 168,142.30
  5. Step 5: Solve for x
    x = 168,142.30/469.39
  6. Step 6: Final answer
    x = 358.22

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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.