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Finding the Fourth Proportional to 936.16, 1,405.20 and 722.08

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Solution

The fourth proportional to 936.16, 1,405.20 and 722.08 is: 1,083.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.16 : 1,405.20 = 722.08 : x
  2. Step 2: Convert to fraction form
    936.16/1,405.20 = 722.08/x
  3. Step 3: Cross multiply
    936.16x = 1,405.20 × 722.08
  4. Step 4: Simplify right side
    936.16x = 1,014,666.82
  5. Step 5: Solve for x
    x = 1,014,666.82/936.16
  6. Step 6: Final answer
    x = 1,083.86

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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.