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Finding the Fourth Proportional to 1,425.36, 2,139.72 and 777.36

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Solution

The fourth proportional to 1,425.36, 2,139.72 and 777.36 is: 1,166.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.36 : 2,139.72 = 777.36 : x
  2. Step 2: Convert to fraction form
    1,425.36/2,139.72 = 777.36/x
  3. Step 3: Cross multiply
    1,425.36x = 2,139.72 × 777.36
  4. Step 4: Simplify right side
    1,425.36x = 1,663,332.74
  5. Step 5: Solve for x
    x = 1,663,332.74/1,425.36
  6. Step 6: Final answer
    x = 1,166.96

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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.