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Finding the Fourth Proportional to 1,387.02, 1,913.60 and 889.94

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Solution

The fourth proportional to 1,387.02, 1,913.60 and 889.94 is: 1,227.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.02 : 1,913.60 = 889.94 : x
  2. Step 2: Convert to fraction form
    1,387.02/1,913.60 = 889.94/x
  3. Step 3: Cross multiply
    1,387.02x = 1,913.60 × 889.94
  4. Step 4: Simplify right side
    1,387.02x = 1,702,975.17
  5. Step 5: Solve for x
    x = 1,702,975.17/1,387.02
  6. Step 6: Final answer
    x = 1,227.79

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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.