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Finding the Fourth Proportional to 1,023.60, 1,415.20 and 892.40

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Solution

The fourth proportional to 1,023.60, 1,415.20 and 892.40 is: 1,233.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,023.60 : 1,415.20 = 892.40 : x
  2. Step 2: Convert to fraction form
    1,023.60/1,415.20 = 892.40/x
  3. Step 3: Cross multiply
    1,023.60x = 1,415.20 × 892.40
  4. Step 4: Simplify right side
    1,023.60x = 1,262,924.48
  5. Step 5: Solve for x
    x = 1,262,924.48/1,023.60
  6. Step 6: Final answer
    x = 1,233.81

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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.