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Finding the Fourth Proportional to 686,912, 947,616 and 485,818.88

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Solution

The fourth proportional to 686,912, 947,616 and 485,818.88 is: 670,201.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,912 : 947,616 = 485,818.88 : x
  2. Step 2: Convert to fraction form
    686,912/947,616 = 485,818.88/x
  3. Step 3: Cross multiply
    686,912x = 947,616 × 485,818.88
  4. Step 4: Simplify right side
    686,912x = 460,369,743,790.08
  5. Step 5: Solve for x
    x = 460,369,743,790.08/686,912
  6. Step 6: Final answer
    x = 670,201.92

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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.