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Finding the Fourth Proportional to 1,108.68, 1,664.04 and 561.24

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Solution

The fourth proportional to 1,108.68, 1,664.04 and 561.24 is: 842.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.68 : 1,664.04 = 561.24 : x
  2. Step 2: Convert to fraction form
    1,108.68/1,664.04 = 561.24/x
  3. Step 3: Cross multiply
    1,108.68x = 1,664.04 × 561.24
  4. Step 4: Simplify right side
    1,108.68x = 933,925.81
  5. Step 5: Solve for x
    x = 933,925.81/1,108.68
  6. Step 6: Final answer
    x = 842.38

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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.