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Finding the Fourth Proportional to 1,039.50, 1,434.80 and 619.71

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Solution

The fourth proportional to 1,039.50, 1,434.80 and 619.71 is: 855.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.50 : 1,434.80 = 619.71 : x
  2. Step 2: Convert to fraction form
    1,039.50/1,434.80 = 619.71/x
  3. Step 3: Cross multiply
    1,039.50x = 1,434.80 × 619.71
  4. Step 4: Simplify right side
    1,039.50x = 889,156.81
  5. Step 5: Solve for x
    x = 889,156.81/1,039.50
  6. Step 6: Final answer
    x = 855.37

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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.