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Finding the Fourth Proportional to 505,679.20, 695,691.12 and 491,682.40

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Solution

The fourth proportional to 505,679.20, 695,691.12 and 491,682.40 is: 676,434.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    505,679.20 : 695,691.12 = 491,682.40 : x
  2. Step 2: Convert to fraction form
    505,679.20/695,691.12 = 491,682.40/x
  3. Step 3: Cross multiply
    505,679.20x = 695,691.12 × 491,682.40
  4. Step 4: Simplify right side
    505,679.20x = 342,059,079,540.29
  5. Step 5: Solve for x
    x = 342,059,079,540.29/505,679.20
  6. Step 6: Final answer
    x = 676,434.94

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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.