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Finding the Fourth Proportional to 1,108.68, 1,663.44 and 553.62

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Solution

The fourth proportional to 1,108.68, 1,663.44 and 553.62 is: 830.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.68 : 1,663.44 = 553.62 : x
  2. Step 2: Convert to fraction form
    1,108.68/1,663.44 = 553.62/x
  3. Step 3: Cross multiply
    1,108.68x = 1,663.44 × 553.62
  4. Step 4: Simplify right side
    1,108.68x = 920,913.65
  5. Step 5: Solve for x
    x = 920,913.65/1,108.68
  6. Step 6: Final answer
    x = 830.64

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1.5x scale

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.