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Finding the Fourth Proportional to 940.88, 1,405.60 and 609.12

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Solution

The fourth proportional to 940.88, 1,405.60 and 609.12 is: 909.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.88 : 1,405.60 = 609.12 : x
  2. Step 2: Convert to fraction form
    940.88/1,405.60 = 609.12/x
  3. Step 3: Cross multiply
    940.88x = 1,405.60 × 609.12
  4. Step 4: Simplify right side
    940.88x = 856,174.17
  5. Step 5: Solve for x
    x = 856,174.17/940.88
  6. Step 6: Final answer
    x = 909.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.