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Finding the Fourth Proportional to 1,415.92, 2,124.24 and 722.32

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Solution

The fourth proportional to 1,415.92, 2,124.24 and 722.32 is: 1,083.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.92 : 2,124.24 = 722.32 : x
  2. Step 2: Convert to fraction form
    1,415.92/2,124.24 = 722.32/x
  3. Step 3: Cross multiply
    1,415.92x = 2,124.24 × 722.32
  4. Step 4: Simplify right side
    1,415.92x = 1,534,381.04
  5. Step 5: Solve for x
    x = 1,534,381.04/1,415.92
  6. Step 6: Final answer
    x = 1,083.66

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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.