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Finding the Fourth Proportional to 940.82, 1,298.15 and 521.15

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Solution

The fourth proportional to 940.82, 1,298.15 and 521.15 is: 719.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.82 : 1,298.15 = 521.15 : x
  2. Step 2: Convert to fraction form
    940.82/1,298.15 = 521.15/x
  3. Step 3: Cross multiply
    940.82x = 1,298.15 × 521.15
  4. Step 4: Simplify right side
    940.82x = 676,530.87
  5. Step 5: Solve for x
    x = 676,530.87/940.82
  6. Step 6: Final answer
    x = 719.09

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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.