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Finding the Fourth Proportional to 942.40, 1,415.20 and 913.60

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Solution

The fourth proportional to 942.40, 1,415.20 and 913.60 is: 1,371.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.40 : 1,415.20 = 913.60 : x
  2. Step 2: Convert to fraction form
    942.40/1,415.20 = 913.60/x
  3. Step 3: Cross multiply
    942.40x = 1,415.20 × 913.60
  4. Step 4: Simplify right side
    942.40x = 1,292,926.72
  5. Step 5: Solve for x
    x = 1,292,926.72/942.40
  6. Step 6: Final answer
    x = 1,371.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.