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Finding the Fourth Proportional to 1,425.88, 2,139.27 and 776.16

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Solution

The fourth proportional to 1,425.88, 2,139.27 and 776.16 is: 1,164.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.88 : 2,139.27 = 776.16 : x
  2. Step 2: Convert to fraction form
    1,425.88/2,139.27 = 776.16/x
  3. Step 3: Cross multiply
    1,425.88x = 2,139.27 × 776.16
  4. Step 4: Simplify right side
    1,425.88x = 1,660,415.80
  5. Step 5: Solve for x
    x = 1,660,415.80/1,425.88
  6. Step 6: Final answer
    x = 1,164.49

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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.