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Finding the Fourth Proportional to 1,988.13, 2,980.04 and 755.00

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Solution

The fourth proportional to 1,988.13, 2,980.04 and 755.00 is: 1,131.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.13 : 2,980.04 = 755.00 : x
  2. Step 2: Convert to fraction form
    1,988.13/2,980.04 = 755.00/x
  3. Step 3: Cross multiply
    1,988.13x = 2,980.04 × 755.00
  4. Step 4: Simplify right side
    1,988.13x = 2,249,915.30
  5. Step 5: Solve for x
    x = 2,249,915.30/1,988.13
  6. Step 6: Final answer
    x = 1,131.67

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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.