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Finding the Fourth Proportional to 670.76, 925.48 and 422.20

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Solution

The fourth proportional to 670.76, 925.48 and 422.20 is: 582.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.76 : 925.48 = 422.20 : x
  2. Step 2: Convert to fraction form
    670.76/925.48 = 422.20/x
  3. Step 3: Cross multiply
    670.76x = 925.48 × 422.20
  4. Step 4: Simplify right side
    670.76x = 390,737.66
  5. Step 5: Solve for x
    x = 390,737.66/670.76
  6. Step 6: Final answer
    x = 582.53

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Find fourth proportional to 335.38, 462.74 and 211.10
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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.