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Finding the Fourth Proportional to 1,108.65, 1,664 and 561.22

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Solution

The fourth proportional to 1,108.65, 1,664 and 561.22 is: 842.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.65 : 1,664 = 561.22 : x
  2. Step 2: Convert to fraction form
    1,108.65/1,664 = 561.22/x
  3. Step 3: Cross multiply
    1,108.65x = 1,664 × 561.22
  4. Step 4: Simplify right side
    1,108.65x = 933,870.08
  5. Step 5: Solve for x
    x = 933,870.08/1,108.65
  6. Step 6: Final answer
    x = 842.35

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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.