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Finding the Fourth Proportional to 830.92, 1,146.78 and 805.42

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Solution

The fourth proportional to 830.92, 1,146.78 and 805.42 is: 1,111.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.92 : 1,146.78 = 805.42 : x
  2. Step 2: Convert to fraction form
    830.92/1,146.78 = 805.42/x
  3. Step 3: Cross multiply
    830.92x = 1,146.78 × 805.42
  4. Step 4: Simplify right side
    830.92x = 923,639.55
  5. Step 5: Solve for x
    x = 923,639.55/830.92
  6. Step 6: Final answer
    x = 1,111.59

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1.5x scale

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.