Home / 2,165.20-2,987.42-1,455.78

Finding the Fourth Proportional to 2,165.20, 2,987.42 and 1,455.78

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Solution

The fourth proportional to 2,165.20, 2,987.42 and 1,455.78 is: 2,008.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.20 : 2,987.42 = 1,455.78 : x
  2. Step 2: Convert to fraction form
    2,165.20/2,987.42 = 1,455.78/x
  3. Step 3: Cross multiply
    2,165.20x = 2,987.42 × 1,455.78
  4. Step 4: Simplify right side
    2,165.20x = 4,349,026.29
  5. Step 5: Solve for x
    x = 4,349,026.29/2,165.20
  6. Step 6: Final answer
    x = 2,008.60

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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.