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Finding the Fourth Proportional to 1,555.05, 2,145.92 and 891.89

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Solution

The fourth proportional to 1,555.05, 2,145.92 and 891.89 is: 1,230.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.05 : 2,145.92 = 891.89 : x
  2. Step 2: Convert to fraction form
    1,555.05/2,145.92 = 891.89/x
  3. Step 3: Cross multiply
    1,555.05x = 2,145.92 × 891.89
  4. Step 4: Simplify right side
    1,555.05x = 1,913,913.92
  5. Step 5: Solve for x
    x = 1,913,913.92/1,555.05
  6. Step 6: Final answer
    x = 1,230.77

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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.