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Finding the Fourth Proportional to 1,392.90, 1,921.86 and 833.58

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Solution

The fourth proportional to 1,392.90, 1,921.86 and 833.58 is: 1,150.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.90 : 1,921.86 = 833.58 : x
  2. Step 2: Convert to fraction form
    1,392.90/1,921.86 = 833.58/x
  3. Step 3: Cross multiply
    1,392.90x = 1,921.86 × 833.58
  4. Step 4: Simplify right side
    1,392.90x = 1,602,024.06
  5. Step 5: Solve for x
    x = 1,602,024.06/1,392.90
  6. Step 6: Final answer
    x = 1,150.14

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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.