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Finding the Fourth Proportional to 1,009.62, 1,392.66 and 710.82

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Solution

The fourth proportional to 1,009.62, 1,392.66 and 710.82 is: 980.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.62 : 1,392.66 = 710.82 : x
  2. Step 2: Convert to fraction form
    1,009.62/1,392.66 = 710.82/x
  3. Step 3: Cross multiply
    1,009.62x = 1,392.66 × 710.82
  4. Step 4: Simplify right side
    1,009.62x = 989,930.58
  5. Step 5: Solve for x
    x = 989,930.58/1,009.62
  6. Step 6: Final answer
    x = 980.50

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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.