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Finding the Fourth Proportional to 1,400.04, 1,931.98 and 779

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Solution

The fourth proportional to 1,400.04, 1,931.98 and 779 is: 1,074.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.04 : 1,931.98 = 779 : x
  2. Step 2: Convert to fraction form
    1,400.04/1,931.98 = 779/x
  3. Step 3: Cross multiply
    1,400.04x = 1,931.98 × 779
  4. Step 4: Simplify right side
    1,400.04x = 1,505,012.42
  5. Step 5: Solve for x
    x = 1,505,012.42/1,400.04
  6. Step 6: Final answer
    x = 1,074.98

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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.