Home / 1,577.83-2,177.55-869.79

Finding the Fourth Proportional to 1,577.83, 2,177.55 and 869.79

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Solution

The fourth proportional to 1,577.83, 2,177.55 and 869.79 is: 1,200.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,577.83 : 2,177.55 = 869.79 : x
  2. Step 2: Convert to fraction form
    1,577.83/2,177.55 = 869.79/x
  3. Step 3: Cross multiply
    1,577.83x = 2,177.55 × 869.79
  4. Step 4: Simplify right side
    1,577.83x = 1,894,011.21
  5. Step 5: Solve for x
    x = 1,894,011.21/1,577.83
  6. Step 6: Final answer
    x = 1,200.39

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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.