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Finding the Fourth Proportional to 1,089.19, 1,500.55 and 891.55

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Solution

The fourth proportional to 1,089.19, 1,500.55 and 891.55 is: 1,228.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.19 : 1,500.55 = 891.55 : x
  2. Step 2: Convert to fraction form
    1,089.19/1,500.55 = 891.55/x
  3. Step 3: Cross multiply
    1,089.19x = 1,500.55 × 891.55
  4. Step 4: Simplify right side
    1,089.19x = 1,337,815.35
  5. Step 5: Solve for x
    x = 1,337,815.35/1,089.19
  6. Step 6: Final answer
    x = 1,228.27

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.