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Finding the Fourth Proportional to 1,690.80, 2,536.18 and 716.76

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Solution

The fourth proportional to 1,690.80, 2,536.18 and 716.76 is: 1,075.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.80 : 2,536.18 = 716.76 : x
  2. Step 2: Convert to fraction form
    1,690.80/2,536.18 = 716.76/x
  3. Step 3: Cross multiply
    1,690.80x = 2,536.18 × 716.76
  4. Step 4: Simplify right side
    1,690.80x = 1,817,832.38
  5. Step 5: Solve for x
    x = 1,817,832.38/1,690.80
  6. Step 6: Final answer
    x = 1,075.13

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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.