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Finding the Fourth Proportional to 1,803, 2,487.19 and 1,139.61

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Solution

The fourth proportional to 1,803, 2,487.19 and 1,139.61 is: 1,572.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,803 : 2,487.19 = 1,139.61 : x
  2. Step 2: Convert to fraction form
    1,803/2,487.19 = 1,139.61/x
  3. Step 3: Cross multiply
    1,803x = 2,487.19 × 1,139.61
  4. Step 4: Simplify right side
    1,803x = 2,834,420.90
  5. Step 5: Solve for x
    x = 2,834,420.90/1,803
  6. Step 6: Final answer
    x = 1,572.06

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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.