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Finding the Fourth Proportional to 670.71, 925.23 and 421.56

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Solution

The fourth proportional to 670.71, 925.23 and 421.56 is: 581.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.71 : 925.23 = 421.56 : x
  2. Step 2: Convert to fraction form
    670.71/925.23 = 421.56/x
  3. Step 3: Cross multiply
    670.71x = 925.23 × 421.56
  4. Step 4: Simplify right side
    670.71x = 390,039.96
  5. Step 5: Solve for x
    x = 390,039.96/670.71
  6. Step 6: Final answer
    x = 581.53

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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.