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Finding the Fourth Proportional to 788.56, 1,088.16 and 439.28

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Solution

The fourth proportional to 788.56, 1,088.16 and 439.28 is: 606.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.56 : 1,088.16 = 439.28 : x
  2. Step 2: Convert to fraction form
    788.56/1,088.16 = 439.28/x
  3. Step 3: Cross multiply
    788.56x = 1,088.16 × 439.28
  4. Step 4: Simplify right side
    788.56x = 478,006.92
  5. Step 5: Solve for x
    x = 478,006.92/788.56
  6. Step 6: Final answer
    x = 606.18

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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.