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Finding the Fourth Proportional to 1,398.55, 1,929.71 and 901.11

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Solution

The fourth proportional to 1,398.55, 1,929.71 and 901.11 is: 1,243.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.55 : 1,929.71 = 901.11 : x
  2. Step 2: Convert to fraction form
    1,398.55/1,929.71 = 901.11/x
  3. Step 3: Cross multiply
    1,398.55x = 1,929.71 × 901.11
  4. Step 4: Simplify right side
    1,398.55x = 1,738,880.98
  5. Step 5: Solve for x
    x = 1,738,880.98/1,398.55
  6. Step 6: Final answer
    x = 1,243.35

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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.