Home / 1,987.02-2,979.64-1,062.40

Finding the Fourth Proportional to 1,987.02, 2,979.64 and 1,062.40

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Solution

The fourth proportional to 1,987.02, 2,979.64 and 1,062.40 is: 1,593.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.02 : 2,979.64 = 1,062.40 : x
  2. Step 2: Convert to fraction form
    1,987.02/2,979.64 = 1,062.40/x
  3. Step 3: Cross multiply
    1,987.02x = 2,979.64 × 1,062.40
  4. Step 4: Simplify right side
    1,987.02x = 3,165,569.54
  5. Step 5: Solve for x
    x = 3,165,569.54/1,987.02
  6. Step 6: Final answer
    x = 1,593.12

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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.