Home / 2,129.70-2,937.87-1,539.21

Finding the Fourth Proportional to 2,129.70, 2,937.87 and 1,539.21

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Solution

The fourth proportional to 2,129.70, 2,937.87 and 1,539.21 is: 2,123.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.70 : 2,937.87 = 1,539.21 : x
  2. Step 2: Convert to fraction form
    2,129.70/2,937.87 = 1,539.21/x
  3. Step 3: Cross multiply
    2,129.70x = 2,937.87 × 1,539.21
  4. Step 4: Simplify right side
    2,129.70x = 4,521,998.88
  5. Step 5: Solve for x
    x = 4,521,998.88/2,129.70
  6. Step 6: Final answer
    x = 2,123.30

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1.5x scale

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.