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Finding the Fourth Proportional to 1,139.21, 1,711.91 and 619.60

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Solution

The fourth proportional to 1,139.21, 1,711.91 and 619.60 is: 931.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.21 : 1,711.91 = 619.60 : x
  2. Step 2: Convert to fraction form
    1,139.21/1,711.91 = 619.60/x
  3. Step 3: Cross multiply
    1,139.21x = 1,711.91 × 619.60
  4. Step 4: Simplify right side
    1,139.21x = 1,060,698.17
  5. Step 5: Solve for x
    x = 1,060,698.17/1,139.21
  6. Step 6: Final answer
    x = 931.08

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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.