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Finding the Fourth Proportional to 1,126.20, 1,689.52 and 510.20

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Solution

The fourth proportional to 1,126.20, 1,689.52 and 510.20 is: 765.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.20 : 1,689.52 = 510.20 : x
  2. Step 2: Convert to fraction form
    1,126.20/1,689.52 = 510.20/x
  3. Step 3: Cross multiply
    1,126.20x = 1,689.52 × 510.20
  4. Step 4: Simplify right side
    1,126.20x = 861,993.10
  5. Step 5: Solve for x
    x = 861,993.10/1,126.20
  6. Step 6: Final answer
    x = 765.40

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1.5x scale

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.