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Finding the Fourth Proportional to 1,425.77, 2,139.45 and 695.35

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Solution

The fourth proportional to 1,425.77, 2,139.45 and 695.35 is: 1,043.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.77 : 2,139.45 = 695.35 : x
  2. Step 2: Convert to fraction form
    1,425.77/2,139.45 = 695.35/x
  3. Step 3: Cross multiply
    1,425.77x = 2,139.45 × 695.35
  4. Step 4: Simplify right side
    1,425.77x = 1,487,666.62
  5. Step 5: Solve for x
    x = 1,487,666.62/1,425.77
  6. Step 6: Final answer
    x = 1,043.41

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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.