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Finding the Fourth Proportional to 469.75, 648.52 and 312.59

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Solution

The fourth proportional to 469.75, 648.52 and 312.59 is: 431.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.75 : 648.52 = 312.59 : x
  2. Step 2: Convert to fraction form
    469.75/648.52 = 312.59/x
  3. Step 3: Cross multiply
    469.75x = 648.52 × 312.59
  4. Step 4: Simplify right side
    469.75x = 202,721.71
  5. Step 5: Solve for x
    x = 202,721.71/469.75
  6. Step 6: Final answer
    x = 431.55

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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.