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Finding the Fourth Proportional to 74,479.60, 111,719.40 and 42,986.80

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Solution

The fourth proportional to 74,479.60, 111,719.40 and 42,986.80 is: 64,480.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,479.60 : 111,719.40 = 42,986.80 : x
  2. Step 2: Convert to fraction form
    74,479.60/111,719.40 = 42,986.80/x
  3. Step 3: Cross multiply
    74,479.60x = 111,719.40 × 42,986.80
  4. Step 4: Simplify right side
    74,479.60x = 4,802,459,503.92
  5. Step 5: Solve for x
    x = 4,802,459,503.92/74,479.60
  6. Step 6: Final answer
    x = 64,480.20

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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.