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Finding the Fourth Proportional to 122,129.49, 168,454.55 and 85,907.77

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Solution

The fourth proportional to 122,129.49, 168,454.55 and 85,907.77 is: 118,493.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,129.49 : 168,454.55 = 85,907.77 : x
  2. Step 2: Convert to fraction form
    122,129.49/168,454.55 = 85,907.77/x
  3. Step 3: Cross multiply
    122,129.49x = 168,454.55 × 85,907.77
  4. Step 4: Simplify right side
    122,129.49x = 14,471,554,307.31
  5. Step 5: Solve for x
    x = 14,471,554,307.31/122,129.49
  6. Step 6: Final answer
    x = 118,493.53

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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.