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Finding the Fourth Proportional to 189,715.72, 261,804.50 and 103,672.80

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Solution

The fourth proportional to 189,715.72, 261,804.50 and 103,672.80 is: 143,066.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,715.72 : 261,804.50 = 103,672.80 : x
  2. Step 2: Convert to fraction form
    189,715.72/261,804.50 = 103,672.80/x
  3. Step 3: Cross multiply
    189,715.72x = 261,804.50 × 103,672.80
  4. Step 4: Simplify right side
    189,715.72x = 27,142,005,567.60
  5. Step 5: Solve for x
    x = 27,142,005,567.60/189,715.72
  6. Step 6: Final answer
    x = 143,066.72

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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.