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Finding the Fourth Proportional to 940.61, 1,297.95 and 520.90

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Solution

The fourth proportional to 940.61, 1,297.95 and 520.90 is: 718.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.61 : 1,297.95 = 520.90 : x
  2. Step 2: Convert to fraction form
    940.61/1,297.95 = 520.90/x
  3. Step 3: Cross multiply
    940.61x = 1,297.95 × 520.90
  4. Step 4: Simplify right side
    940.61x = 676,096.96
  5. Step 5: Solve for x
    x = 676,096.96/940.61
  6. Step 6: Final answer
    x = 718.78

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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.