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Finding the Fourth Proportional to 78,124.86, 107,782.56 and 57,755.84

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Solution

The fourth proportional to 78,124.86, 107,782.56 and 57,755.84 is: 79,681.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,124.86 : 107,782.56 = 57,755.84 : x
  2. Step 2: Convert to fraction form
    78,124.86/107,782.56 = 57,755.84/x
  3. Step 3: Cross multiply
    78,124.86x = 107,782.56 × 57,755.84
  4. Step 4: Simplify right side
    78,124.86x = 6,225,071,751.24
  5. Step 5: Solve for x
    x = 6,225,071,751.24/78,124.86
  6. Step 6: Final answer
    x = 79,681.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.