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Finding the Fourth Proportional to 299,980.80, 449,971.20 and 78,364.80

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Solution

The fourth proportional to 299,980.80, 449,971.20 and 78,364.80 is: 117,547.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    299,980.80 : 449,971.20 = 78,364.80 : x
  2. Step 2: Convert to fraction form
    299,980.80/449,971.20 = 78,364.80/x
  3. Step 3: Cross multiply
    299,980.80x = 449,971.20 × 78,364.80
  4. Step 4: Simplify right side
    299,980.80x = 35,261,903,093.76
  5. Step 5: Solve for x
    x = 35,261,903,093.76/299,980.80
  6. Step 6: Final answer
    x = 117,547.20

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1.5x scale

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.