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Finding the Fourth Proportional to 788.78, 1,088.49 and 439.46

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Solution

The fourth proportional to 788.78, 1,088.49 and 439.46 is: 606.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.78 : 1,088.49 = 439.46 : x
  2. Step 2: Convert to fraction form
    788.78/1,088.49 = 439.46/x
  3. Step 3: Cross multiply
    788.78x = 1,088.49 × 439.46
  4. Step 4: Simplify right side
    788.78x = 478,347.82
  5. Step 5: Solve for x
    x = 478,347.82/788.78
  6. Step 6: Final answer
    x = 606.44

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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.