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Finding the Fourth Proportional to 122,486.40, 168,989.76 and 77,800.32

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Solution

The fourth proportional to 122,486.40, 168,989.76 and 77,800.32 is: 107,338.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,486.40 : 168,989.76 = 77,800.32 : x
  2. Step 2: Convert to fraction form
    122,486.40/168,989.76 = 77,800.32/x
  3. Step 3: Cross multiply
    122,486.40x = 168,989.76 × 77,800.32
  4. Step 4: Simplify right side
    122,486.40x = 13,147,457,404.72
  5. Step 5: Solve for x
    x = 13,147,457,404.72/122,486.40
  6. Step 6: Final answer
    x = 107,338.10

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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.