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Finding the Fourth Proportional to 78,040.80, 116,863.20 and 42,940.80

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Solution

The fourth proportional to 78,040.80, 116,863.20 and 42,940.80 is: 64,302.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,040.80 : 116,863.20 = 42,940.80 : x
  2. Step 2: Convert to fraction form
    78,040.80/116,863.20 = 42,940.80/x
  3. Step 3: Cross multiply
    78,040.80x = 116,863.20 × 42,940.80
  4. Step 4: Simplify right side
    78,040.80x = 5,018,199,298.56
  5. Step 5: Solve for x
    x = 5,018,199,298.56/78,040.80
  6. Step 6: Final answer
    x = 64,302.25

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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.