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Finding the Fourth Proportional to 1,374.12, 2,058.06 and 642.15

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Solution

The fourth proportional to 1,374.12, 2,058.06 and 642.15 is: 961.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.12 : 2,058.06 = 642.15 : x
  2. Step 2: Convert to fraction form
    1,374.12/2,058.06 = 642.15/x
  3. Step 3: Cross multiply
    1,374.12x = 2,058.06 × 642.15
  4. Step 4: Simplify right side
    1,374.12x = 1,321,583.23
  5. Step 5: Solve for x
    x = 1,321,583.23/1,374.12
  6. Step 6: Final answer
    x = 961.77

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1.5x scale

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.