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Finding the Fourth Proportional to 1,690.18, 2,539.74 and 910.78

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Solution

The fourth proportional to 1,690.18, 2,539.74 and 910.78 is: 1,368.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,690.18 : 2,539.74 = 910.78 : x
  2. Step 2: Convert to fraction form
    1,690.18/2,539.74 = 910.78/x
  3. Step 3: Cross multiply
    1,690.18x = 2,539.74 × 910.78
  4. Step 4: Simplify right side
    1,690.18x = 2,313,144.40
  5. Step 5: Solve for x
    x = 2,313,144.40/1,690.18
  6. Step 6: Final answer
    x = 1,368.58

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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.