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Finding the Fourth Proportional to 1,291.51, 1,937.28 and 511.17

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Solution

The fourth proportional to 1,291.51, 1,937.28 and 511.17 is: 766.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.51 : 1,937.28 = 511.17 : x
  2. Step 2: Convert to fraction form
    1,291.51/1,937.28 = 511.17/x
  3. Step 3: Cross multiply
    1,291.51x = 1,937.28 × 511.17
  4. Step 4: Simplify right side
    1,291.51x = 990,279.42
  5. Step 5: Solve for x
    x = 990,279.42/1,291.51
  6. Step 6: Final answer
    x = 766.76

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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.