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Finding the Fourth Proportional to 112,345.15, 154,965.11 and 85,428.65

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Solution

The fourth proportional to 112,345.15, 154,965.11 and 85,428.65 is: 117,837.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,345.15 : 154,965.11 = 85,428.65 : x
  2. Step 2: Convert to fraction form
    112,345.15/154,965.11 = 85,428.65/x
  3. Step 3: Cross multiply
    112,345.15x = 154,965.11 × 85,428.65
  4. Step 4: Simplify right side
    112,345.15x = 13,238,460,144.40
  5. Step 5: Solve for x
    x = 13,238,460,144.40/112,345.15
  6. Step 6: Final answer
    x = 117,837.40

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.