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Finding the Fourth Proportional to 830.20, 1,237.16 and 757.30

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Solution

The fourth proportional to 830.20, 1,237.16 and 757.30 is: 1,128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.20 : 1,237.16 = 757.30 : x
  2. Step 2: Convert to fraction form
    830.20/1,237.16 = 757.30/x
  3. Step 3: Cross multiply
    830.20x = 1,237.16 × 757.30
  4. Step 4: Simplify right side
    830.20x = 936,901.27
  5. Step 5: Solve for x
    x = 936,901.27/830.20
  6. Step 6: Final answer
    x = 1,128.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.