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Finding the Fourth Proportional to 1,126.71, 1,690.28 and 510.71

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Solution

The fourth proportional to 1,126.71, 1,690.28 and 510.71 is: 766.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.71 : 1,690.28 = 510.71 : x
  2. Step 2: Convert to fraction form
    1,126.71/1,690.28 = 510.71/x
  3. Step 3: Cross multiply
    1,126.71x = 1,690.28 × 510.71
  4. Step 4: Simplify right side
    1,126.71x = 863,231.89
  5. Step 5: Solve for x
    x = 863,231.89/1,126.71
  6. Step 6: Final answer
    x = 766.15

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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.