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Finding the Fourth Proportional to 942.98, 1,415.37 and 578.48

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Solution

The fourth proportional to 942.98, 1,415.37 and 578.48 is: 868.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.98 : 1,415.37 = 578.48 : x
  2. Step 2: Convert to fraction form
    942.98/1,415.37 = 578.48/x
  3. Step 3: Cross multiply
    942.98x = 1,415.37 × 578.48
  4. Step 4: Simplify right side
    942.98x = 818,763.24
  5. Step 5: Solve for x
    x = 818,763.24/942.98
  6. Step 6: Final answer
    x = 868.27

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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.