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Finding the Fourth Proportional to 1,039.62, 1,434.85 and 619.99

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Solution

The fourth proportional to 1,039.62, 1,434.85 and 619.99 is: 855.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.62 : 1,434.85 = 619.99 : x
  2. Step 2: Convert to fraction form
    1,039.62/1,434.85 = 619.99/x
  3. Step 3: Cross multiply
    1,039.62x = 1,434.85 × 619.99
  4. Step 4: Simplify right side
    1,039.62x = 889,587.51
  5. Step 5: Solve for x
    x = 889,587.51/1,039.62
  6. Step 6: Final answer
    x = 855.69

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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.