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Finding the Fourth Proportional to 1,048.60, 1,428.04 and 1,042.12

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Solution

The fourth proportional to 1,048.60, 1,428.04 and 1,042.12 is: 1,419.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.60 : 1,428.04 = 1,042.12 : x
  2. Step 2: Convert to fraction form
    1,048.60/1,428.04 = 1,042.12/x
  3. Step 3: Cross multiply
    1,048.60x = 1,428.04 × 1,042.12
  4. Step 4: Simplify right side
    1,048.60x = 1,488,189.04
  5. Step 5: Solve for x
    x = 1,488,189.04/1,048.60
  6. Step 6: Final answer
    x = 1,419.22

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.