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Finding the Fourth Proportional to 940.81, 1,298.40 and 567.79

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Solution

The fourth proportional to 940.81, 1,298.40 and 567.79 is: 783.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.81 : 1,298.40 = 567.79 : x
  2. Step 2: Convert to fraction form
    940.81/1,298.40 = 567.79/x
  3. Step 3: Cross multiply
    940.81x = 1,298.40 × 567.79
  4. Step 4: Simplify right side
    940.81x = 737,218.54
  5. Step 5: Solve for x
    x = 737,218.54/940.81
  6. Step 6: Final answer
    x = 783.60

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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.