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Finding the Fourth Proportional to 142,783.80, 213,986.70 and 76,080.30

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Solution

The fourth proportional to 142,783.80, 213,986.70 and 76,080.30 is: 114,019.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,783.80 : 213,986.70 = 76,080.30 : x
  2. Step 2: Convert to fraction form
    142,783.80/213,986.70 = 76,080.30/x
  3. Step 3: Cross multiply
    142,783.80x = 213,986.70 × 76,080.30
  4. Step 4: Simplify right side
    142,783.80x = 16,280,172,332.01
  5. Step 5: Solve for x
    x = 16,280,172,332.01/142,783.80
  6. Step 6: Final answer
    x = 114,019.74

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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.