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Finding the Fourth Proportional to 626.75, 864.73 and 390.73

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Solution

The fourth proportional to 626.75, 864.73 and 390.73 is: 539.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.75 : 864.73 = 390.73 : x
  2. Step 2: Convert to fraction form
    626.75/864.73 = 390.73/x
  3. Step 3: Cross multiply
    626.75x = 864.73 × 390.73
  4. Step 4: Simplify right side
    626.75x = 337,875.95
  5. Step 5: Solve for x
    x = 337,875.95/626.75
  6. Step 6: Final answer
    x = 539.09

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Find fourth proportional to 313.38, 432.37 and 195.37
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1.5x scale

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.