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Finding the Fourth Proportional to 930.36, 1,283.91 and 557.35

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Solution

The fourth proportional to 930.36, 1,283.91 and 557.35 is: 769.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.36 : 1,283.91 = 557.35 : x
  2. Step 2: Convert to fraction form
    930.36/1,283.91 = 557.35/x
  3. Step 3: Cross multiply
    930.36x = 1,283.91 × 557.35
  4. Step 4: Simplify right side
    930.36x = 715,587.24
  5. Step 5: Solve for x
    x = 715,587.24/930.36
  6. Step 6: Final answer
    x = 769.15

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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.