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Finding the Fourth Proportional to 40,648.19, 60,978.15 and 12,570.56

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Solution

The fourth proportional to 40,648.19, 60,978.15 and 12,570.56 is: 18,857.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,648.19 : 60,978.15 = 12,570.56 : x
  2. Step 2: Convert to fraction form
    40,648.19/60,978.15 = 12,570.56/x
  3. Step 3: Cross multiply
    40,648.19x = 60,978.15 × 12,570.56
  4. Step 4: Simplify right side
    40,648.19x = 766,529,188.37
  5. Step 5: Solve for x
    x = 766,529,188.37/40,648.19
  6. Step 6: Final answer
    x = 18,857.65

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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.