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Finding the Fourth Proportional to 1,820.32, 2,730.14 and 987.00

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Solution

The fourth proportional to 1,820.32, 2,730.14 and 987.00 is: 1,480.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,820.32 : 2,730.14 = 987.00 : x
  2. Step 2: Convert to fraction form
    1,820.32/2,730.14 = 987.00/x
  3. Step 3: Cross multiply
    1,820.32x = 2,730.14 × 987.00
  4. Step 4: Simplify right side
    1,820.32x = 2,694,636.71
  5. Step 5: Solve for x
    x = 2,694,636.71/1,820.32
  6. Step 6: Final answer
    x = 1,480.31

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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.