Home / 1,551.29-2,140.75-869.92

Finding the Fourth Proportional to 1,551.29, 2,140.75 and 869.92

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Solution

The fourth proportional to 1,551.29, 2,140.75 and 869.92 is: 1,200.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.29 : 2,140.75 = 869.92 : x
  2. Step 2: Convert to fraction form
    1,551.29/2,140.75 = 869.92/x
  3. Step 3: Cross multiply
    1,551.29x = 2,140.75 × 869.92
  4. Step 4: Simplify right side
    1,551.29x = 1,862,281.24
  5. Step 5: Solve for x
    x = 1,862,281.24/1,551.29
  6. Step 6: Final answer
    x = 1,200.47

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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.