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Finding the Fourth Proportional to 82,357.40, 123,536.10 and 81,045.20

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Solution

The fourth proportional to 82,357.40, 123,536.10 and 81,045.20 is: 121,567.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,357.40 : 123,536.10 = 81,045.20 : x
  2. Step 2: Convert to fraction form
    82,357.40/123,536.10 = 81,045.20/x
  3. Step 3: Cross multiply
    82,357.40x = 123,536.10 × 81,045.20
  4. Step 4: Simplify right side
    82,357.40x = 10,012,007,931.72
  5. Step 5: Solve for x
    x = 10,012,007,931.72/82,357.40
  6. Step 6: Final answer
    x = 121,567.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.