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Finding the Fourth Proportional to 1,554.80, 2,145.02 and 891.30

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Solution

The fourth proportional to 1,554.80, 2,145.02 and 891.30 is: 1,229.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,554.80 : 2,145.02 = 891.30 : x
  2. Step 2: Convert to fraction form
    1,554.80/2,145.02 = 891.30/x
  3. Step 3: Cross multiply
    1,554.80x = 2,145.02 × 891.30
  4. Step 4: Simplify right side
    1,554.80x = 1,911,856.33
  5. Step 5: Solve for x
    x = 1,911,856.33/1,554.80
  6. Step 6: Final answer
    x = 1,229.65

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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.