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Finding the Fourth Proportional to 941.12, 1,298.71 and 521.45

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Solution

The fourth proportional to 941.12, 1,298.71 and 521.45 is: 719.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.12 : 1,298.71 = 521.45 : x
  2. Step 2: Convert to fraction form
    941.12/1,298.71 = 521.45/x
  3. Step 3: Cross multiply
    941.12x = 1,298.71 × 521.45
  4. Step 4: Simplify right side
    941.12x = 677,212.33
  5. Step 5: Solve for x
    x = 677,212.33/941.12
  6. Step 6: Final answer
    x = 719.59

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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.