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Finding the Fourth Proportional to 1,126.85, 1,690.43 and 510.71

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Solution

The fourth proportional to 1,126.85, 1,690.43 and 510.71 is: 766.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.85 : 1,690.43 = 510.71 : x
  2. Step 2: Convert to fraction form
    1,126.85/1,690.43 = 510.71/x
  3. Step 3: Cross multiply
    1,126.85x = 1,690.43 × 510.71
  4. Step 4: Simplify right side
    1,126.85x = 863,308.50
  5. Step 5: Solve for x
    x = 863,308.50/1,126.85
  6. Step 6: Final answer
    x = 766.13

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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.