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Finding the Fourth Proportional to 670.75, 925.64 and 391.18

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Solution

The fourth proportional to 670.75, 925.64 and 391.18 is: 539.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.75 : 925.64 = 391.18 : x
  2. Step 2: Convert to fraction form
    670.75/925.64 = 391.18/x
  3. Step 3: Cross multiply
    670.75x = 925.64 × 391.18
  4. Step 4: Simplify right side
    670.75x = 362,087.23
  5. Step 5: Solve for x
    x = 362,087.23/670.75
  6. Step 6: Final answer
    x = 539.82

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Find fourth proportional to 335.38, 462.82 and 195.59
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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.