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Finding the Fourth Proportional to 212,424.98, 318,637.46 and 79,315.63

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Solution

The fourth proportional to 212,424.98, 318,637.46 and 79,315.63 is: 118,973.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,424.98 : 318,637.46 = 79,315.63 : x
  2. Step 2: Convert to fraction form
    212,424.98/318,637.46 = 79,315.63/x
  3. Step 3: Cross multiply
    212,424.98x = 318,637.46 × 79,315.63
  4. Step 4: Simplify right side
    212,424.98x = 25,272,930,283.20
  5. Step 5: Solve for x
    x = 25,272,930,283.20/212,424.98
  6. Step 6: Final answer
    x = 118,973.44

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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.