Home / 1,550.40-2,139.50-929.40

Finding the Fourth Proportional to 1,550.40, 2,139.50 and 929.40

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Solution

The fourth proportional to 1,550.40, 2,139.50 and 929.40 is: 1,282.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.40 : 2,139.50 = 929.40 : x
  2. Step 2: Convert to fraction form
    1,550.40/2,139.50 = 929.40/x
  3. Step 3: Cross multiply
    1,550.40x = 2,139.50 × 929.40
  4. Step 4: Simplify right side
    1,550.40x = 1,988,451.30
  5. Step 5: Solve for x
    x = 1,988,451.30/1,550.40
  6. Step 6: Final answer
    x = 1,282.54

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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.