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Finding the Fourth Proportional to 784.76, 1,177.20 and 419.58

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Solution

The fourth proportional to 784.76, 1,177.20 and 419.58 is: 629.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.76 : 1,177.20 = 419.58 : x
  2. Step 2: Convert to fraction form
    784.76/1,177.20 = 419.58/x
  3. Step 3: Cross multiply
    784.76x = 1,177.20 × 419.58
  4. Step 4: Simplify right side
    784.76x = 493,929.58
  5. Step 5: Solve for x
    x = 493,929.58/784.76
  6. Step 6: Final answer
    x = 629.41

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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.