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Finding the Fourth Proportional to 1,670.68, 2,505.60 and 745.72

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Solution

The fourth proportional to 1,670.68, 2,505.60 and 745.72 is: 1,118.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,670.68 : 2,505.60 = 745.72 : x
  2. Step 2: Convert to fraction form
    1,670.68/2,505.60 = 745.72/x
  3. Step 3: Cross multiply
    1,670.68x = 2,505.60 × 745.72
  4. Step 4: Simplify right side
    1,670.68x = 1,868,483.86
  5. Step 5: Solve for x
    x = 1,868,483.86/1,670.68
  6. Step 6: Final answer
    x = 1,118.40

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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.