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Finding the Fourth Proportional to 70,415.20, 105,661.20 and 28,866.40

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Solution

The fourth proportional to 70,415.20, 105,661.20 and 28,866.40 is: 43,315.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,415.20 : 105,661.20 = 28,866.40 : x
  2. Step 2: Convert to fraction form
    70,415.20/105,661.20 = 28,866.40/x
  3. Step 3: Cross multiply
    70,415.20x = 105,661.20 × 28,866.40
  4. Step 4: Simplify right side
    70,415.20x = 3,050,058,463.68
  5. Step 5: Solve for x
    x = 3,050,058,463.68/70,415.20
  6. Step 6: Final answer
    x = 43,315.34

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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.