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Finding the Fourth Proportional to 780.05, 1,168.72 and 559.53

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Solution

The fourth proportional to 780.05, 1,168.72 and 559.53 is: 838.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.05 : 1,168.72 = 559.53 : x
  2. Step 2: Convert to fraction form
    780.05/1,168.72 = 559.53/x
  3. Step 3: Cross multiply
    780.05x = 1,168.72 × 559.53
  4. Step 4: Simplify right side
    780.05x = 653,932.50
  5. Step 5: Solve for x
    x = 653,932.50/780.05
  6. Step 6: Final answer
    x = 838.32

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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.