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Finding the Fourth Proportional to 788.69, 1,088.39 and 439.38

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Solution

The fourth proportional to 788.69, 1,088.39 and 439.38 is: 606.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.69 : 1,088.39 = 439.38 : x
  2. Step 2: Convert to fraction form
    788.69/1,088.39 = 439.38/x
  3. Step 3: Cross multiply
    788.69x = 1,088.39 × 439.38
  4. Step 4: Simplify right side
    788.69x = 478,216.80
  5. Step 5: Solve for x
    x = 478,216.80/788.69
  6. Step 6: Final answer
    x = 606.34

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Double scale
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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.