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Finding the Fourth Proportional to 72,731.40, 100,368.70 and 40,899.60

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Solution

The fourth proportional to 72,731.40, 100,368.70 and 40,899.60 is: 56,441.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,731.40 : 100,368.70 = 40,899.60 : x
  2. Step 2: Convert to fraction form
    72,731.40/100,368.70 = 40,899.60/x
  3. Step 3: Cross multiply
    72,731.40x = 100,368.70 × 40,899.60
  4. Step 4: Simplify right side
    72,731.40x = 4,105,039,682.52
  5. Step 5: Solve for x
    x = 4,105,039,682.52/72,731.40
  6. Step 6: Final answer
    x = 56,441.09

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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.