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Finding the Fourth Proportional to 788.63, 1,088.35 and 439.31

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Solution

The fourth proportional to 788.63, 1,088.35 and 439.31 is: 606.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.63 : 1,088.35 = 439.31 : x
  2. Step 2: Convert to fraction form
    788.63/1,088.35 = 439.31/x
  3. Step 3: Cross multiply
    788.63x = 1,088.35 × 439.31
  4. Step 4: Simplify right side
    788.63x = 478,124.66
  5. Step 5: Solve for x
    x = 478,124.66/788.63
  6. Step 6: Final answer
    x = 606.28

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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.