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Finding the Fourth Proportional to 1,370.99, 1,892.01 and 781.51

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Solution

The fourth proportional to 1,370.99, 1,892.01 and 781.51 is: 1,078.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.99 : 1,892.01 = 781.51 : x
  2. Step 2: Convert to fraction form
    1,370.99/1,892.01 = 781.51/x
  3. Step 3: Cross multiply
    1,370.99x = 1,892.01 × 781.51
  4. Step 4: Simplify right side
    1,370.99x = 1,478,624.74
  5. Step 5: Solve for x
    x = 1,478,624.74/1,370.99
  6. Step 6: Final answer
    x = 1,078.51

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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.