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Finding the Fourth Proportional to 670.15, 925.22 and 421.83

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Solution

The fourth proportional to 670.15, 925.22 and 421.83 is: 582.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.15 : 925.22 = 421.83 : x
  2. Step 2: Convert to fraction form
    670.15/925.22 = 421.83/x
  3. Step 3: Cross multiply
    670.15x = 925.22 × 421.83
  4. Step 4: Simplify right side
    670.15x = 390,285.55
  5. Step 5: Solve for x
    x = 390,285.55/670.15
  6. Step 6: Final answer
    x = 582.39

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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.