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Finding the Fourth Proportional to 981.63, 1,355.09 and 608.49

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Solution

The fourth proportional to 981.63, 1,355.09 and 608.49 is: 839.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.63 : 1,355.09 = 608.49 : x
  2. Step 2: Convert to fraction form
    981.63/1,355.09 = 608.49/x
  3. Step 3: Cross multiply
    981.63x = 1,355.09 × 608.49
  4. Step 4: Simplify right side
    981.63x = 824,555.67
  5. Step 5: Solve for x
    x = 824,555.67/981.63
  6. Step 6: Final answer
    x = 839.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.