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Finding the Fourth Proportional to 1,315.69, 1,972.89 and 621.77

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Solution

The fourth proportional to 1,315.69, 1,972.89 and 621.77 is: 932.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.69 : 1,972.89 = 621.77 : x
  2. Step 2: Convert to fraction form
    1,315.69/1,972.89 = 621.77/x
  3. Step 3: Cross multiply
    1,315.69x = 1,972.89 × 621.77
  4. Step 4: Simplify right side
    1,315.69x = 1,226,673.95
  5. Step 5: Solve for x
    x = 1,226,673.95/1,315.69
  6. Step 6: Final answer
    x = 932.34

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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.