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Finding the Fourth Proportional to 670.92, 925.74 and 405.51

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Solution

The fourth proportional to 670.92, 925.74 and 405.51 is: 559.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.92 : 925.74 = 405.51 : x
  2. Step 2: Convert to fraction form
    670.92/925.74 = 405.51/x
  3. Step 3: Cross multiply
    670.92x = 925.74 × 405.51
  4. Step 4: Simplify right side
    670.92x = 375,396.83
  5. Step 5: Solve for x
    x = 375,396.83/670.92
  6. Step 6: Final answer
    x = 559.53

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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.