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Finding the Fourth Proportional to 469.15, 647.40 and 259.31

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Solution

The fourth proportional to 469.15, 647.40 and 259.31 is: 357.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.15 : 647.40 = 259.31 : x
  2. Step 2: Convert to fraction form
    469.15/647.40 = 259.31/x
  3. Step 3: Cross multiply
    469.15x = 647.40 × 259.31
  4. Step 4: Simplify right side
    469.15x = 167,877.29
  5. Step 5: Solve for x
    x = 167,877.29/469.15
  6. Step 6: Final answer
    x = 357.83

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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.