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Finding the Fourth Proportional to 784.68, 1,179.72 and 624.36

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Solution

The fourth proportional to 784.68, 1,179.72 and 624.36 is: 938.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.68 : 1,179.72 = 624.36 : x
  2. Step 2: Convert to fraction form
    784.68/1,179.72 = 624.36/x
  3. Step 3: Cross multiply
    784.68x = 1,179.72 × 624.36
  4. Step 4: Simplify right side
    784.68x = 736,569.98
  5. Step 5: Solve for x
    x = 736,569.98/784.68
  6. Step 6: Final answer
    x = 938.69

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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.