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Finding the Fourth Proportional to 1,009.14, 1,392.65 and 561.02

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Solution

The fourth proportional to 1,009.14, 1,392.65 and 561.02 is: 774.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.14 : 1,392.65 = 561.02 : x
  2. Step 2: Convert to fraction form
    1,009.14/1,392.65 = 561.02/x
  3. Step 3: Cross multiply
    1,009.14x = 1,392.65 × 561.02
  4. Step 4: Simplify right side
    1,009.14x = 781,294.73
  5. Step 5: Solve for x
    x = 781,294.73/1,009.14
  6. Step 6: Final answer
    x = 774.22

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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.