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Finding the Fourth Proportional to 72,321.64, 99,733.62 and 56,400.28

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Solution

The fourth proportional to 72,321.64, 99,733.62 and 56,400.28 is: 77,777.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,321.64 : 99,733.62 = 56,400.28 : x
  2. Step 2: Convert to fraction form
    72,321.64/99,733.62 = 56,400.28/x
  3. Step 3: Cross multiply
    72,321.64x = 99,733.62 × 56,400.28
  4. Step 4: Simplify right side
    72,321.64x = 5,625,004,093.41
  5. Step 5: Solve for x
    x = 5,625,004,093.41/72,321.64
  6. Step 6: Final answer
    x = 77,777.61

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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.