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Finding the Fourth Proportional to 77,615.76, 107,121.34 and 47,418.52

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Solution

The fourth proportional to 77,615.76, 107,121.34 and 47,418.52 is: 65,444.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,615.76 : 107,121.34 = 47,418.52 : x
  2. Step 2: Convert to fraction form
    77,615.76/107,121.34 = 47,418.52/x
  3. Step 3: Cross multiply
    77,615.76x = 107,121.34 × 47,418.52
  4. Step 4: Simplify right side
    77,615.76x = 5,079,535,403.22
  5. Step 5: Solve for x
    x = 5,079,535,403.22/77,615.76
  6. Step 6: Final answer
    x = 65,444.64

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1.5x scale

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.