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Finding the Fourth Proportional to 1,985.05, 2,975.90 and 751.78

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Solution

The fourth proportional to 1,985.05, 2,975.90 and 751.78 is: 1,127.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.05 : 2,975.90 = 751.78 : x
  2. Step 2: Convert to fraction form
    1,985.05/2,975.90 = 751.78/x
  3. Step 3: Cross multiply
    1,985.05x = 2,975.90 × 751.78
  4. Step 4: Simplify right side
    1,985.05x = 2,237,218.34
  5. Step 5: Solve for x
    x = 2,237,218.34/1,985.05
  6. Step 6: Final answer
    x = 1,127.03

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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.