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Finding the Fourth Proportional to 1,690.55, 2,536.07 and 520.65

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Solution

The fourth proportional to 1,690.55, 2,536.07 and 520.65 is: 781.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.55 : 2,536.07 = 520.65 : x
  2. Step 2: Convert to fraction form
    1,690.55/2,536.07 = 520.65/x
  3. Step 3: Cross multiply
    1,690.55x = 2,536.07 × 520.65
  4. Step 4: Simplify right side
    1,690.55x = 1,320,402.24
  5. Step 5: Solve for x
    x = 1,320,402.24/1,690.55
  6. Step 6: Final answer
    x = 781.05

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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.