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Finding the Fourth Proportional to 1,542.58, 2,314.56 and 840

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Solution

The fourth proportional to 1,542.58, 2,314.56 and 840 is: 1,260.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,542.58 : 2,314.56 = 840 : x
  2. Step 2: Convert to fraction form
    1,542.58/2,314.56 = 840/x
  3. Step 3: Cross multiply
    1,542.58x = 2,314.56 × 840
  4. Step 4: Simplify right side
    1,542.58x = 1,944,230.40
  5. Step 5: Solve for x
    x = 1,944,230.40/1,542.58
  6. Step 6: Final answer
    x = 1,260.38

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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.