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Finding the Fourth Proportional to 1,353.57, 2,030.63 and 612.80

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Solution

The fourth proportional to 1,353.57, 2,030.63 and 612.80 is: 919.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,353.57 : 2,030.63 = 612.80 : x
  2. Step 2: Convert to fraction form
    1,353.57/2,030.63 = 612.80/x
  3. Step 3: Cross multiply
    1,353.57x = 2,030.63 × 612.80
  4. Step 4: Simplify right side
    1,353.57x = 1,244,370.06
  5. Step 5: Solve for x
    x = 1,244,370.06/1,353.57
  6. Step 6: Final answer
    x = 919.32

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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.