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Finding the Fourth Proportional to 788.64, 1,088.31 and 439.32

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Solution

The fourth proportional to 788.64, 1,088.31 and 439.32 is: 606.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.64 : 1,088.31 = 439.32 : x
  2. Step 2: Convert to fraction form
    788.64/1,088.31 = 439.32/x
  3. Step 3: Cross multiply
    788.64x = 1,088.31 × 439.32
  4. Step 4: Simplify right side
    788.64x = 478,116.35
  5. Step 5: Solve for x
    x = 478,116.35/788.64
  6. Step 6: Final answer
    x = 606.25

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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.