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Finding the Fourth Proportional to 940.88, 1,298.39 and 521.25

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Solution

The fourth proportional to 940.88, 1,298.39 and 521.25 is: 719.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.88 : 1,298.39 = 521.25 : x
  2. Step 2: Convert to fraction form
    940.88/1,298.39 = 521.25/x
  3. Step 3: Cross multiply
    940.88x = 1,298.39 × 521.25
  4. Step 4: Simplify right side
    940.88x = 676,788.05
  5. Step 5: Solve for x
    x = 676,788.05/940.88
  6. Step 6: Final answer
    x = 719.31

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Double scale
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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.