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Finding the Fourth Proportional to 469.70, 648.30 and 312.59

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Solution

The fourth proportional to 469.70, 648.30 and 312.59 is: 431.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.70 : 648.30 = 312.59 : x
  2. Step 2: Convert to fraction form
    469.70/648.30 = 312.59/x
  3. Step 3: Cross multiply
    469.70x = 648.30 × 312.59
  4. Step 4: Simplify right side
    469.70x = 202,654.89
  5. Step 5: Solve for x
    x = 202,654.89/469.70
  6. Step 6: Final answer
    x = 431.46

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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.