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Finding the Fourth Proportional to 783.90, 1,073.75 and 781.74

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Solution

The fourth proportional to 783.90, 1,073.75 and 781.74 is: 1,070.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.90 : 1,073.75 = 781.74 : x
  2. Step 2: Convert to fraction form
    783.90/1,073.75 = 781.74/x
  3. Step 3: Cross multiply
    783.90x = 1,073.75 × 781.74
  4. Step 4: Simplify right side
    783.90x = 839,389.42
  5. Step 5: Solve for x
    x = 839,389.42/783.90
  6. Step 6: Final answer
    x = 1,070.79

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.