Home / 1,555.21-2,146.12-891.58

Finding the Fourth Proportional to 1,555.21, 2,146.12 and 891.58

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Solution

The fourth proportional to 1,555.21, 2,146.12 and 891.58 is: 1,230.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.21 : 2,146.12 = 891.58 : x
  2. Step 2: Convert to fraction form
    1,555.21/2,146.12 = 891.58/x
  3. Step 3: Cross multiply
    1,555.21x = 2,146.12 × 891.58
  4. Step 4: Simplify right side
    1,555.21x = 1,913,437.67
  5. Step 5: Solve for x
    x = 1,913,437.67/1,555.21
  6. Step 6: Final answer
    x = 1,230.34

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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.