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Finding the Fourth Proportional to 940.80, 1,298.27 and 515.44

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Solution

The fourth proportional to 940.80, 1,298.27 and 515.44 is: 711.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.80 : 1,298.27 = 515.44 : x
  2. Step 2: Convert to fraction form
    940.80/1,298.27 = 515.44/x
  3. Step 3: Cross multiply
    940.80x = 1,298.27 × 515.44
  4. Step 4: Simplify right side
    940.80x = 669,178.10
  5. Step 5: Solve for x
    x = 669,178.10/940.80
  6. Step 6: Final answer
    x = 711.28

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1.5x scale

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.