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Finding the Fourth Proportional to 1,145.30, 1,581.20 and 753

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Solution

The fourth proportional to 1,145.30, 1,581.20 and 753 is: 1,039.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.30 : 1,581.20 = 753 : x
  2. Step 2: Convert to fraction form
    1,145.30/1,581.20 = 753/x
  3. Step 3: Cross multiply
    1,145.30x = 1,581.20 × 753
  4. Step 4: Simplify right side
    1,145.30x = 1,190,643.60
  5. Step 5: Solve for x
    x = 1,190,643.60/1,145.30
  6. Step 6: Final answer
    x = 1,039.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.