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Finding the Fourth Proportional to 1,720.12, 2,580.18 and 745.63

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Solution

The fourth proportional to 1,720.12, 2,580.18 and 745.63 is: 1,118.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.12 : 2,580.18 = 745.63 : x
  2. Step 2: Convert to fraction form
    1,720.12/2,580.18 = 745.63/x
  3. Step 3: Cross multiply
    1,720.12x = 2,580.18 × 745.63
  4. Step 4: Simplify right side
    1,720.12x = 1,923,859.61
  5. Step 5: Solve for x
    x = 1,923,859.61/1,720.12
  6. Step 6: Final answer
    x = 1,118.45

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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.