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Finding the Fourth Proportional to 940.89, 1,298.15 and 609.71

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Solution

The fourth proportional to 940.89, 1,298.15 and 609.71 is: 841.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.89 : 1,298.15 = 609.71 : x
  2. Step 2: Convert to fraction form
    940.89/1,298.15 = 609.71/x
  3. Step 3: Cross multiply
    940.89x = 1,298.15 × 609.71
  4. Step 4: Simplify right side
    940.89x = 791,485.50
  5. Step 5: Solve for x
    x = 791,485.50/940.89
  6. Step 6: Final answer
    x = 841.21

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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.