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Finding the Fourth Proportional to 1,329.85, 1,995.18 and 508.20

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Solution

The fourth proportional to 1,329.85, 1,995.18 and 508.20 is: 762.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.85 : 1,995.18 = 508.20 : x
  2. Step 2: Convert to fraction form
    1,329.85/1,995.18 = 508.20/x
  3. Step 3: Cross multiply
    1,329.85x = 1,995.18 × 508.20
  4. Step 4: Simplify right side
    1,329.85x = 1,013,950.48
  5. Step 5: Solve for x
    x = 1,013,950.48/1,329.85
  6. Step 6: Final answer
    x = 762.45

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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.