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Finding the Fourth Proportional to 784.16, 1,081.78 and 504.32

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Solution

The fourth proportional to 784.16, 1,081.78 and 504.32 is: 695.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.16 : 1,081.78 = 504.32 : x
  2. Step 2: Convert to fraction form
    784.16/1,081.78 = 504.32/x
  3. Step 3: Cross multiply
    784.16x = 1,081.78 × 504.32
  4. Step 4: Simplify right side
    784.16x = 545,563.29
  5. Step 5: Solve for x
    x = 545,563.29/784.16
  6. Step 6: Final answer
    x = 695.73

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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.