Home / 1,551.15-2,139.63-921.26

Finding the Fourth Proportional to 1,551.15, 2,139.63 and 921.26

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Solution

The fourth proportional to 1,551.15, 2,139.63 and 921.26 is: 1,270.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.15 : 2,139.63 = 921.26 : x
  2. Step 2: Convert to fraction form
    1,551.15/2,139.63 = 921.26/x
  3. Step 3: Cross multiply
    1,551.15x = 2,139.63 × 921.26
  4. Step 4: Simplify right side
    1,551.15x = 1,971,155.53
  5. Step 5: Solve for x
    x = 1,971,155.53/1,551.15
  6. Step 6: Final answer
    x = 1,270.77

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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.