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Finding the Fourth Proportional to 1,009.90, 1,393.70 and 611.69

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Solution

The fourth proportional to 1,009.90, 1,393.70 and 611.69 is: 844.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.90 : 1,393.70 = 611.69 : x
  2. Step 2: Convert to fraction form
    1,009.90/1,393.70 = 611.69/x
  3. Step 3: Cross multiply
    1,009.90x = 1,393.70 × 611.69
  4. Step 4: Simplify right side
    1,009.90x = 852,512.35
  5. Step 5: Solve for x
    x = 852,512.35/1,009.90
  6. Step 6: Final answer
    x = 844.16

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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.