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Finding the Fourth Proportional to 798.54, 1,195.80 and 505.15

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Solution

The fourth proportional to 798.54, 1,195.80 and 505.15 is: 756.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.54 : 1,195.80 = 505.15 : x
  2. Step 2: Convert to fraction form
    798.54/1,195.80 = 505.15/x
  3. Step 3: Cross multiply
    798.54x = 1,195.80 × 505.15
  4. Step 4: Simplify right side
    798.54x = 604,053.49
  5. Step 5: Solve for x
    x = 604,053.49/798.54
  6. Step 6: Final answer
    x = 756.45

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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.