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Finding the Fourth Proportional to 830.30, 1,246.80 and 557.60

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Solution

The fourth proportional to 830.30, 1,246.80 and 557.60 is: 837.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.30 : 1,246.80 = 557.60 : x
  2. Step 2: Convert to fraction form
    830.30/1,246.80 = 557.60/x
  3. Step 3: Cross multiply
    830.30x = 1,246.80 × 557.60
  4. Step 4: Simplify right side
    830.30x = 695,215.68
  5. Step 5: Solve for x
    x = 695,215.68/830.30
  6. Step 6: Final answer
    x = 837.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.