Home / 1,108.95-1,664.45-561.51

Finding the Fourth Proportional to 1,108.95, 1,664.45 and 561.51

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Solution

The fourth proportional to 1,108.95, 1,664.45 and 561.51 is: 842.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.95 : 1,664.45 = 561.51 : x
  2. Step 2: Convert to fraction form
    1,108.95/1,664.45 = 561.51/x
  3. Step 3: Cross multiply
    1,108.95x = 1,664.45 × 561.51
  4. Step 4: Simplify right side
    1,108.95x = 934,608.75
  5. Step 5: Solve for x
    x = 934,608.75/1,108.95
  6. Step 6: Final answer
    x = 842.79

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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.