Home / 1,551.58-2,140.24-921.70

Finding the Fourth Proportional to 1,551.58, 2,140.24 and 921.70

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Solution

The fourth proportional to 1,551.58, 2,140.24 and 921.70 is: 1,271.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.58 : 2,140.24 = 921.70 : x
  2. Step 2: Convert to fraction form
    1,551.58/2,140.24 = 921.70/x
  3. Step 3: Cross multiply
    1,551.58x = 2,140.24 × 921.70
  4. Step 4: Simplify right side
    1,551.58x = 1,972,659.21
  5. Step 5: Solve for x
    x = 1,972,659.21/1,551.58
  6. Step 6: Final answer
    x = 1,271.39

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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.