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Finding the Fourth Proportional to 830.43, 1,145.81 and 515.81

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Solution

The fourth proportional to 830.43, 1,145.81 and 515.81 is: 711.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.43 : 1,145.81 = 515.81 : x
  2. Step 2: Convert to fraction form
    830.43/1,145.81 = 515.81/x
  3. Step 3: Cross multiply
    830.43x = 1,145.81 × 515.81
  4. Step 4: Simplify right side
    830.43x = 591,024.41
  5. Step 5: Solve for x
    x = 591,024.41/830.43
  6. Step 6: Final answer
    x = 711.71

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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.