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Finding the Fourth Proportional to 2,139.80, 3,209.85 and 907.07

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Solution

The fourth proportional to 2,139.80, 3,209.85 and 907.07 is: 1,360.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.80 : 3,209.85 = 907.07 : x
  2. Step 2: Convert to fraction form
    2,139.80/3,209.85 = 907.07/x
  3. Step 3: Cross multiply
    2,139.80x = 3,209.85 × 907.07
  4. Step 4: Simplify right side
    2,139.80x = 2,911,542.59
  5. Step 5: Solve for x
    x = 2,911,542.59/2,139.80
  6. Step 6: Final answer
    x = 1,360.66

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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.