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Finding the Fourth Proportional to 981.78, 1,355.92 and 609.65

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Solution

The fourth proportional to 981.78, 1,355.92 and 609.65 is: 841.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.78 : 1,355.92 = 609.65 : x
  2. Step 2: Convert to fraction form
    981.78/1,355.92 = 609.65/x
  3. Step 3: Cross multiply
    981.78x = 1,355.92 × 609.65
  4. Step 4: Simplify right side
    981.78x = 826,636.63
  5. Step 5: Solve for x
    x = 826,636.63/981.78
  6. Step 6: Final answer
    x = 841.98

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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.