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Finding the Fourth Proportional to 943.61, 1,415.33 and 578.21

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Solution

The fourth proportional to 943.61, 1,415.33 and 578.21 is: 867.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.61 : 1,415.33 = 578.21 : x
  2. Step 2: Convert to fraction form
    943.61/1,415.33 = 578.21/x
  3. Step 3: Cross multiply
    943.61x = 1,415.33 × 578.21
  4. Step 4: Simplify right side
    943.61x = 818,355.07
  5. Step 5: Solve for x
    x = 818,355.07/943.61
  6. Step 6: Final answer
    x = 867.26

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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.