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Finding the Fourth Proportional to 1,039.76, 1,559.82 and 390.68

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Solution

The fourth proportional to 1,039.76, 1,559.82 and 390.68 is: 586.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.76 : 1,559.82 = 390.68 : x
  2. Step 2: Convert to fraction form
    1,039.76/1,559.82 = 390.68/x
  3. Step 3: Cross multiply
    1,039.76x = 1,559.82 × 390.68
  4. Step 4: Simplify right side
    1,039.76x = 609,390.48
  5. Step 5: Solve for x
    x = 609,390.48/1,039.76
  6. Step 6: Final answer
    x = 586.09

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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.