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Finding the Fourth Proportional to 72,382.64, 99,889.80 and 40,558.40

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Solution

The fourth proportional to 72,382.64, 99,889.80 and 40,558.40 is: 55,971.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,382.64 : 99,889.80 = 40,558.40 : x
  2. Step 2: Convert to fraction form
    72,382.64/99,889.80 = 40,558.40/x
  3. Step 3: Cross multiply
    72,382.64x = 99,889.80 × 40,558.40
  4. Step 4: Simplify right side
    72,382.64x = 4,051,370,464.32
  5. Step 5: Solve for x
    x = 4,051,370,464.32/72,382.64
  6. Step 6: Final answer
    x = 55,971.58

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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.