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Finding the Fourth Proportional to 1,808.10, 2,710.80 and 987.30

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Solution

The fourth proportional to 1,808.10, 2,710.80 and 987.30 is: 1,480.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.10 : 2,710.80 = 987.30 : x
  2. Step 2: Convert to fraction form
    1,808.10/2,710.80 = 987.30/x
  3. Step 3: Cross multiply
    1,808.10x = 2,710.80 × 987.30
  4. Step 4: Simplify right side
    1,808.10x = 2,676,372.84
  5. Step 5: Solve for x
    x = 2,676,372.84/1,808.10
  6. Step 6: Final answer
    x = 1,480.21

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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.