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Finding the Fourth Proportional to 391,015.55, 539,597.30 and 218,935.10

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Solution

The fourth proportional to 391,015.55, 539,597.30 and 218,935.10 is: 302,128.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,015.55 : 539,597.30 = 218,935.10 : x
  2. Step 2: Convert to fraction form
    391,015.55/539,597.30 = 218,935.10/x
  3. Step 3: Cross multiply
    391,015.55x = 539,597.30 × 218,935.10
  4. Step 4: Simplify right side
    391,015.55x = 118,136,789,089.55
  5. Step 5: Solve for x
    x = 118,136,789,089.55/391,015.55
  6. Step 6: Final answer
    x = 302,128.11

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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.