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Finding the Fourth Proportional to 122,129.91, 168,444.50 and 81,830.79

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Solution

The fourth proportional to 122,129.91, 168,444.50 and 81,830.79 is: 112,862.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,129.91 : 168,444.50 = 81,830.79 : x
  2. Step 2: Convert to fraction form
    122,129.91/168,444.50 = 81,830.79/x
  3. Step 3: Cross multiply
    122,129.91x = 168,444.50 × 81,830.79
  4. Step 4: Simplify right side
    122,129.91x = 13,783,946,097.00
  5. Step 5: Solve for x
    x = 13,783,946,097.00/122,129.91
  6. Step 6: Final answer
    x = 112,862.98

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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.