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Finding the Fourth Proportional to 1,639.78, 2,459.67 and 545.37

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Solution

The fourth proportional to 1,639.78, 2,459.67 and 545.37 is: 818.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.78 : 2,459.67 = 545.37 : x
  2. Step 2: Convert to fraction form
    1,639.78/2,459.67 = 545.37/x
  3. Step 3: Cross multiply
    1,639.78x = 2,459.67 × 545.37
  4. Step 4: Simplify right side
    1,639.78x = 1,341,430.23
  5. Step 5: Solve for x
    x = 1,341,430.23/1,639.78
  6. Step 6: Final answer
    x = 818.06

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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.