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Finding the Fourth Proportional to 2,460.78, 3,690.45 and 817.20

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Solution

The fourth proportional to 2,460.78, 3,690.45 and 817.20 is: 1,225.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,460.78 : 3,690.45 = 817.20 : x
  2. Step 2: Convert to fraction form
    2,460.78/3,690.45 = 817.20/x
  3. Step 3: Cross multiply
    2,460.78x = 3,690.45 × 817.20
  4. Step 4: Simplify right side
    2,460.78x = 3,015,835.74
  5. Step 5: Solve for x
    x = 3,015,835.74/2,460.78
  6. Step 6: Final answer
    x = 1,225.56

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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.