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Finding the Fourth Proportional to 74,729.60, 111,964.80 and 48,420.80

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Solution

The fourth proportional to 74,729.60, 111,964.80 and 48,420.80 is: 72,547.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,729.60 : 111,964.80 = 48,420.80 : x
  2. Step 2: Convert to fraction form
    74,729.60/111,964.80 = 48,420.80/x
  3. Step 3: Cross multiply
    74,729.60x = 111,964.80 × 48,420.80
  4. Step 4: Simplify right side
    74,729.60x = 5,421,425,187.84
  5. Step 5: Solve for x
    x = 5,421,425,187.84/74,729.60
  6. Step 6: Final answer
    x = 72,547.23

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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.