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Finding the Fourth Proportional to 42,647.20, 63,970.80 and 40,919.20

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Solution

The fourth proportional to 42,647.20, 63,970.80 and 40,919.20 is: 61,378.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,647.20 : 63,970.80 = 40,919.20 : x
  2. Step 2: Convert to fraction form
    42,647.20/63,970.80 = 40,919.20/x
  3. Step 3: Cross multiply
    42,647.20x = 63,970.80 × 40,919.20
  4. Step 4: Simplify right side
    42,647.20x = 2,617,633,959.36
  5. Step 5: Solve for x
    x = 2,617,633,959.36/42,647.20
  6. Step 6: Final answer
    x = 61,378.80

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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.