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Finding the Fourth Proportional to 781.55, 1,079.40 and 606.62

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Solution

The fourth proportional to 781.55, 1,079.40 and 606.62 is: 837.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.55 : 1,079.40 = 606.62 : x
  2. Step 2: Convert to fraction form
    781.55/1,079.40 = 606.62/x
  3. Step 3: Cross multiply
    781.55x = 1,079.40 × 606.62
  4. Step 4: Simplify right side
    781.55x = 654,785.63
  5. Step 5: Solve for x
    x = 654,785.63/781.55
  6. Step 6: Final answer
    x = 837.81

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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.