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Finding the Fourth Proportional to 1,390.69, 1,919.14 and 761.22

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Solution

The fourth proportional to 1,390.69, 1,919.14 and 761.22 is: 1,050.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.69 : 1,919.14 = 761.22 : x
  2. Step 2: Convert to fraction form
    1,390.69/1,919.14 = 761.22/x
  3. Step 3: Cross multiply
    1,390.69x = 1,919.14 × 761.22
  4. Step 4: Simplify right side
    1,390.69x = 1,460,895.53
  5. Step 5: Solve for x
    x = 1,460,895.53/1,390.69
  6. Step 6: Final answer
    x = 1,050.48

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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.