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Finding the Fourth Proportional to 122,386.32, 168,830.28 and 81,620.64

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Solution

The fourth proportional to 122,386.32, 168,830.28 and 81,620.64 is: 112,594.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,386.32 : 168,830.28 = 81,620.64 : x
  2. Step 2: Convert to fraction form
    122,386.32/168,830.28 = 81,620.64/x
  3. Step 3: Cross multiply
    122,386.32x = 168,830.28 × 81,620.64
  4. Step 4: Simplify right side
    122,386.32x = 13,780,035,504.98
  5. Step 5: Solve for x
    x = 13,780,035,504.98/122,386.32
  6. Step 6: Final answer
    x = 112,594.57

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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.