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Finding the Fourth Proportional to 1,407.42, 1,942.07 and 777.86

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Solution

The fourth proportional to 1,407.42, 1,942.07 and 777.86 is: 1,073.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.42 : 1,942.07 = 777.86 : x
  2. Step 2: Convert to fraction form
    1,407.42/1,942.07 = 777.86/x
  3. Step 3: Cross multiply
    1,407.42x = 1,942.07 × 777.86
  4. Step 4: Simplify right side
    1,407.42x = 1,510,670.29
  5. Step 5: Solve for x
    x = 1,510,670.29/1,407.42
  6. Step 6: Final answer
    x = 1,073.36

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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.