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Finding the Fourth Proportional to 830.59, 1,243.76 and 648.95

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Solution

The fourth proportional to 830.59, 1,243.76 and 648.95 is: 971.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.59 : 1,243.76 = 648.95 : x
  2. Step 2: Convert to fraction form
    830.59/1,243.76 = 648.95/x
  3. Step 3: Cross multiply
    830.59x = 1,243.76 × 648.95
  4. Step 4: Simplify right side
    830.59x = 807,128.59
  5. Step 5: Solve for x
    x = 807,128.59/830.59
  6. Step 6: Final answer
    x = 971.76

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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.