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Finding the Fourth Proportional to 1,690.10, 2,536.55 and 716.87

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Solution

The fourth proportional to 1,690.10, 2,536.55 and 716.87 is: 1,075.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.10 : 2,536.55 = 716.87 : x
  2. Step 2: Convert to fraction form
    1,690.10/2,536.55 = 716.87/x
  3. Step 3: Cross multiply
    1,690.10x = 2,536.55 × 716.87
  4. Step 4: Simplify right side
    1,690.10x = 1,818,376.60
  5. Step 5: Solve for x
    x = 1,818,376.60/1,690.10
  6. Step 6: Final answer
    x = 1,075.90

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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.