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Finding the Fourth Proportional to 1,388.07, 1,913.93 and 1,289.66

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Solution

The fourth proportional to 1,388.07, 1,913.93 and 1,289.66 is: 1,778.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.07 : 1,913.93 = 1,289.66 : x
  2. Step 2: Convert to fraction form
    1,388.07/1,913.93 = 1,289.66/x
  3. Step 3: Cross multiply
    1,388.07x = 1,913.93 × 1,289.66
  4. Step 4: Simplify right side
    1,388.07x = 2,468,307.78
  5. Step 5: Solve for x
    x = 2,468,307.78/1,388.07
  6. Step 6: Final answer
    x = 1,778.23

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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.