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Finding the Fourth Proportional to 688.05, 948.83 and 609.39

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Solution

The fourth proportional to 688.05, 948.83 and 609.39 is: 840.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.05 : 948.83 = 609.39 : x
  2. Step 2: Convert to fraction form
    688.05/948.83 = 609.39/x
  3. Step 3: Cross multiply
    688.05x = 948.83 × 609.39
  4. Step 4: Simplify right side
    688.05x = 578,204.47
  5. Step 5: Solve for x
    x = 578,204.47/688.05
  6. Step 6: Final answer
    x = 840.35

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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.