Home / 12,805.63-17,671.70-7,140.45

Finding the Fourth Proportional to 12,805.63, 17,671.70 and 7,140.45

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Solution

The fourth proportional to 12,805.63, 17,671.70 and 7,140.45 is: 9,853.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,805.63 : 17,671.70 = 7,140.45 : x
  2. Step 2: Convert to fraction form
    12,805.63/17,671.70 = 7,140.45/x
  3. Step 3: Cross multiply
    12,805.63x = 17,671.70 × 7,140.45
  4. Step 4: Simplify right side
    12,805.63x = 126,183,834.82
  5. Step 5: Solve for x
    x = 126,183,834.82/12,805.63
  6. Step 6: Final answer
    x = 9,853.78

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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.