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Finding the Fourth Proportional to 1,400.95, 2,101.34 and 620.72

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Solution

The fourth proportional to 1,400.95, 2,101.34 and 620.72 is: 931.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.95 : 2,101.34 = 620.72 : x
  2. Step 2: Convert to fraction form
    1,400.95/2,101.34 = 620.72/x
  3. Step 3: Cross multiply
    1,400.95x = 2,101.34 × 620.72
  4. Step 4: Simplify right side
    1,400.95x = 1,304,349.02
  5. Step 5: Solve for x
    x = 1,304,349.02/1,400.95
  6. Step 6: Final answer
    x = 931.05

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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.