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Finding the Fourth Proportional to 940.49, 1,298.50 and 720.59

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Solution

The fourth proportional to 940.49, 1,298.50 and 720.59 is: 994.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.49 : 1,298.50 = 720.59 : x
  2. Step 2: Convert to fraction form
    940.49/1,298.50 = 720.59/x
  3. Step 3: Cross multiply
    940.49x = 1,298.50 × 720.59
  4. Step 4: Simplify right side
    940.49x = 935,677.82
  5. Step 5: Solve for x
    x = 935,677.82/940.49
  6. Step 6: Final answer
    x = 994.89

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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.