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Finding the Fourth Proportional to 391,161.68, 539,758.44 and 219,055.72

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Solution

The fourth proportional to 391,161.68, 539,758.44 and 219,055.72 is: 302,271.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,161.68 : 539,758.44 = 219,055.72 : x
  2. Step 2: Convert to fraction form
    391,161.68/539,758.44 = 219,055.72/x
  3. Step 3: Cross multiply
    391,161.68x = 539,758.44 × 219,055.72
  4. Step 4: Simplify right side
    391,161.68x = 118,237,173,700.28
  5. Step 5: Solve for x
    x = 118,237,173,700.28/391,161.68
  6. Step 6: Final answer
    x = 302,271.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.