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Finding the Fourth Proportional to 1,987.15, 2,979.96 and 946.35

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Solution

The fourth proportional to 1,987.15, 2,979.96 and 946.35 is: 1,419.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.15 : 2,979.96 = 946.35 : x
  2. Step 2: Convert to fraction form
    1,987.15/2,979.96 = 946.35/x
  3. Step 3: Cross multiply
    1,987.15x = 2,979.96 × 946.35
  4. Step 4: Simplify right side
    1,987.15x = 2,820,085.15
  5. Step 5: Solve for x
    x = 2,820,085.15/1,987.15
  6. Step 6: Final answer
    x = 1,419.16

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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.