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Finding the Fourth Proportional to 784.74, 1,176.06 and 438.18

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Solution

The fourth proportional to 784.74, 1,176.06 and 438.18 is: 656.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.74 : 1,176.06 = 438.18 : x
  2. Step 2: Convert to fraction form
    784.74/1,176.06 = 438.18/x
  3. Step 3: Cross multiply
    784.74x = 1,176.06 × 438.18
  4. Step 4: Simplify right side
    784.74x = 515,325.97
  5. Step 5: Solve for x
    x = 515,325.97/784.74
  6. Step 6: Final answer
    x = 656.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.