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Finding the Fourth Proportional to 688,515, 950,239.80 and 386,709

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Solution

The fourth proportional to 688,515, 950,239.80 and 386,709 is: 533,708.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    688,515 : 950,239.80 = 386,709 : x
  2. Step 2: Convert to fraction form
    688,515/950,239.80 = 386,709/x
  3. Step 3: Cross multiply
    688,515x = 950,239.80 × 386,709
  4. Step 4: Simplify right side
    688,515x = 367,466,282,818.20
  5. Step 5: Solve for x
    x = 367,466,282,818.20/688,515
  6. Step 6: Final answer
    x = 533,708.46

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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.