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Finding the Fourth Proportional to 652.80, 900.89 and 390.97

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Solution

The fourth proportional to 652.80, 900.89 and 390.97 is: 539.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    652.80 : 900.89 = 390.97 : x
  2. Step 2: Convert to fraction form
    652.80/900.89 = 390.97/x
  3. Step 3: Cross multiply
    652.80x = 900.89 × 390.97
  4. Step 4: Simplify right side
    652.80x = 352,220.96
  5. Step 5: Solve for x
    x = 352,220.96/652.80
  6. Step 6: Final answer
    x = 539.55

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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.