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Finding the Fourth Proportional to 1,615.40, 2,420.78 and 920.63

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Solution

The fourth proportional to 1,615.40, 2,420.78 and 920.63 is: 1,379.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.40 : 2,420.78 = 920.63 : x
  2. Step 2: Convert to fraction form
    1,615.40/2,420.78 = 920.63/x
  3. Step 3: Cross multiply
    1,615.40x = 2,420.78 × 920.63
  4. Step 4: Simplify right side
    1,615.40x = 2,228,625.98
  5. Step 5: Solve for x
    x = 2,228,625.98/1,615.40
  6. Step 6: Final answer
    x = 1,379.62

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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.