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Finding the Fourth Proportional to 112,686.78, 168,784.53 and 56,428.77

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Solution

The fourth proportional to 112,686.78, 168,784.53 and 56,428.77 is: 84,520.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,686.78 : 168,784.53 = 56,428.77 : x
  2. Step 2: Convert to fraction form
    112,686.78/168,784.53 = 56,428.77/x
  3. Step 3: Cross multiply
    112,686.78x = 168,784.53 × 56,428.77
  4. Step 4: Simplify right side
    112,686.78x = 9,524,303,422.93
  5. Step 5: Solve for x
    x = 9,524,303,422.93/112,686.78
  6. Step 6: Final answer
    x = 84,520.15

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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.