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Finding the Fourth Proportional to 1,206.34, 1,809.49 and 621.50

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Solution

The fourth proportional to 1,206.34, 1,809.49 and 621.50 is: 932.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.34 : 1,809.49 = 621.50 : x
  2. Step 2: Convert to fraction form
    1,206.34/1,809.49 = 621.50/x
  3. Step 3: Cross multiply
    1,206.34x = 1,809.49 × 621.50
  4. Step 4: Simplify right side
    1,206.34x = 1,124,598.04
  5. Step 5: Solve for x
    x = 1,124,598.04/1,206.34
  6. Step 6: Final answer
    x = 932.24

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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.