Home / 1,555.07-2,146.17-891.80

Finding the Fourth Proportional to 1,555.07, 2,146.17 and 891.80

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Solution

The fourth proportional to 1,555.07, 2,146.17 and 891.80 is: 1,230.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.07 : 2,146.17 = 891.80 : x
  2. Step 2: Convert to fraction form
    1,555.07/2,146.17 = 891.80/x
  3. Step 3: Cross multiply
    1,555.07x = 2,146.17 × 891.80
  4. Step 4: Simplify right side
    1,555.07x = 1,913,941.45
  5. Step 5: Solve for x
    x = 1,913,941.45/1,555.07
  6. Step 6: Final answer
    x = 1,230.78

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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.