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Finding the Fourth Proportional to 686,942.74, 947,360.43 and 428,843.52

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Solution

The fourth proportional to 686,942.74, 947,360.43 and 428,843.52 is: 591,416.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,942.74 : 947,360.43 = 428,843.52 : x
  2. Step 2: Convert to fraction form
    686,942.74/947,360.43 = 428,843.52/x
  3. Step 3: Cross multiply
    686,942.74x = 947,360.43 × 428,843.52
  4. Step 4: Simplify right side
    686,942.74x = 406,269,381,509.91
  5. Step 5: Solve for x
    x = 406,269,381,509.91/686,942.74
  6. Step 6: Final answer
    x = 591,416.66

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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.