Home / 1,985.20-2,977.40-579.54

Finding the Fourth Proportional to 1,985.20, 2,977.40 and 579.54

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Solution

The fourth proportional to 1,985.20, 2,977.40 and 579.54 is: 869.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.20 : 2,977.40 = 579.54 : x
  2. Step 2: Convert to fraction form
    1,985.20/2,977.40 = 579.54/x
  3. Step 3: Cross multiply
    1,985.20x = 2,977.40 × 579.54
  4. Step 4: Simplify right side
    1,985.20x = 1,725,522.40
  5. Step 5: Solve for x
    x = 1,725,522.40/1,985.20
  6. Step 6: Final answer
    x = 869.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.