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Finding the Fourth Proportional to 1,423.58, 2,135.36 and 545.87

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Solution

The fourth proportional to 1,423.58, 2,135.36 and 545.87 is: 818.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.58 : 2,135.36 = 545.87 : x
  2. Step 2: Convert to fraction form
    1,423.58/2,135.36 = 545.87/x
  3. Step 3: Cross multiply
    1,423.58x = 2,135.36 × 545.87
  4. Step 4: Simplify right side
    1,423.58x = 1,165,635.67
  5. Step 5: Solve for x
    x = 1,165,635.67/1,423.58
  6. Step 6: Final answer
    x = 818.81

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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.