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Finding the Fourth Proportional to 543,335.40, 815,780.70 and 307,139.40

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Solution

The fourth proportional to 543,335.40, 815,780.70 and 307,139.40 is: 461,148.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,335.40 : 815,780.70 = 307,139.40 : x
  2. Step 2: Convert to fraction form
    543,335.40/815,780.70 = 307,139.40/x
  3. Step 3: Cross multiply
    543,335.40x = 815,780.70 × 307,139.40
  4. Step 4: Simplify right side
    543,335.40x = 250,558,394,729.58
  5. Step 5: Solve for x
    x = 250,558,394,729.58/543,335.40
  6. Step 6: Final answer
    x = 461,148.67

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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.