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Finding the Fourth Proportional to 784.04, 1,078.44 and 693.80

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Solution

The fourth proportional to 784.04, 1,078.44 and 693.80 is: 954.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.04 : 1,078.44 = 693.80 : x
  2. Step 2: Convert to fraction form
    784.04/1,078.44 = 693.80/x
  3. Step 3: Cross multiply
    784.04x = 1,078.44 × 693.80
  4. Step 4: Simplify right side
    784.04x = 748,221.67
  5. Step 5: Solve for x
    x = 748,221.67/784.04
  6. Step 6: Final answer
    x = 954.32

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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.