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Finding the Fourth Proportional to 3,612.57, 5,420.16 and 1,420.08

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Solution

The fourth proportional to 3,612.57, 5,420.16 and 1,420.08 is: 2,130.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,612.57 : 5,420.16 = 1,420.08 : x
  2. Step 2: Convert to fraction form
    3,612.57/5,420.16 = 1,420.08/x
  3. Step 3: Cross multiply
    3,612.57x = 5,420.16 × 1,420.08
  4. Step 4: Simplify right side
    3,612.57x = 7,697,060.81
  5. Step 5: Solve for x
    x = 7,697,060.81/3,612.57
  6. Step 6: Final answer
    x = 2,130.63

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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.