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Finding the Fourth Proportional to 140,428.80, 210,643.20 and 51,685.20

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Solution

The fourth proportional to 140,428.80, 210,643.20 and 51,685.20 is: 77,527.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,428.80 : 210,643.20 = 51,685.20 : x
  2. Step 2: Convert to fraction form
    140,428.80/210,643.20 = 51,685.20/x
  3. Step 3: Cross multiply
    140,428.80x = 210,643.20 × 51,685.20
  4. Step 4: Simplify right side
    140,428.80x = 10,887,135,920.64
  5. Step 5: Solve for x
    x = 10,887,135,920.64/140,428.80
  6. Step 6: Final answer
    x = 77,527.80

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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.