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Finding the Fourth Proportional to 1,407.36, 1,942.14 and 777.88

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Solution

The fourth proportional to 1,407.36, 1,942.14 and 777.88 is: 1,073.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.36 : 1,942.14 = 777.88 : x
  2. Step 2: Convert to fraction form
    1,407.36/1,942.14 = 777.88/x
  3. Step 3: Cross multiply
    1,407.36x = 1,942.14 × 777.88
  4. Step 4: Simplify right side
    1,407.36x = 1,510,751.86
  5. Step 5: Solve for x
    x = 1,510,751.86/1,407.36
  6. Step 6: Final answer
    x = 1,073.47

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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.