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Finding the Fourth Proportional to 74,912.80, 112,412.40 and 28,199.20

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Solution

The fourth proportional to 74,912.80, 112,412.40 and 28,199.20 is: 42,315.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,912.80 : 112,412.40 = 28,199.20 : x
  2. Step 2: Convert to fraction form
    74,912.80/112,412.40 = 28,199.20/x
  3. Step 3: Cross multiply
    74,912.80x = 112,412.40 × 28,199.20
  4. Step 4: Simplify right side
    74,912.80x = 3,169,939,750.08
  5. Step 5: Solve for x
    x = 3,169,939,750.08/74,912.80
  6. Step 6: Final answer
    x = 42,315.06

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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.