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Finding the Fourth Proportional to 112,345.41, 154,965.46 and 85,428.90

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Solution

The fourth proportional to 112,345.41, 154,965.46 and 85,428.90 is: 117,837.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,345.41 : 154,965.46 = 85,428.90 : x
  2. Step 2: Convert to fraction form
    112,345.41/154,965.46 = 85,428.90/x
  3. Step 3: Cross multiply
    112,345.41x = 154,965.46 × 85,428.90
  4. Step 4: Simplify right side
    112,345.41x = 13,238,528,785.79
  5. Step 5: Solve for x
    x = 13,238,528,785.79/112,345.41
  6. Step 6: Final answer
    x = 117,837.74

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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.