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Finding the Fourth Proportional to 1,987.83, 2,981.88 and 877.32

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Solution

The fourth proportional to 1,987.83, 2,981.88 and 877.32 is: 1,316.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.83 : 2,981.88 = 877.32 : x
  2. Step 2: Convert to fraction form
    1,987.83/2,981.88 = 877.32/x
  3. Step 3: Cross multiply
    1,987.83x = 2,981.88 × 877.32
  4. Step 4: Simplify right side
    1,987.83x = 2,616,062.96
  5. Step 5: Solve for x
    x = 2,616,062.96/1,987.83
  6. Step 6: Final answer
    x = 1,316.04

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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.