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Finding the Fourth Proportional to 485.35, 669.45 and 469.28

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Solution

The fourth proportional to 485.35, 669.45 and 469.28 is: 647.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.35 : 669.45 = 469.28 : x
  2. Step 2: Convert to fraction form
    485.35/669.45 = 469.28/x
  3. Step 3: Cross multiply
    485.35x = 669.45 × 469.28
  4. Step 4: Simplify right side
    485.35x = 314,160.29
  5. Step 5: Solve for x
    x = 314,160.29/485.35
  6. Step 6: Final answer
    x = 647.28

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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.