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Finding the Fourth Proportional to 940.79, 1,298.08 and 625.70

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Solution

The fourth proportional to 940.79, 1,298.08 and 625.70 is: 863.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.79 : 1,298.08 = 625.70 : x
  2. Step 2: Convert to fraction form
    940.79/1,298.08 = 625.70/x
  3. Step 3: Cross multiply
    940.79x = 1,298.08 × 625.70
  4. Step 4: Simplify right side
    940.79x = 812,208.66
  5. Step 5: Solve for x
    x = 812,208.66/940.79
  6. Step 6: Final answer
    x = 863.33

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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.