Home / 212,911.49-319,354.67-79,780.59

Finding the Fourth Proportional to 212,911.49, 319,354.67 and 79,780.59

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Solution

The fourth proportional to 212,911.49, 319,354.67 and 79,780.59 is: 119,666.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,911.49 : 319,354.67 = 79,780.59 : x
  2. Step 2: Convert to fraction form
    212,911.49/319,354.67 = 79,780.59/x
  3. Step 3: Cross multiply
    212,911.49x = 319,354.67 × 79,780.59
  4. Step 4: Simplify right side
    212,911.49x = 25,478,303,592.95
  5. Step 5: Solve for x
    x = 25,478,303,592.95/212,911.49
  6. Step 6: Final answer
    x = 119,666.18

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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.