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Finding the Fourth Proportional to 128,043.77, 191,970.54 and 61,420.46

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Solution

The fourth proportional to 128,043.77, 191,970.54 and 61,420.46 is: 92,085.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,043.77 : 191,970.54 = 61,420.46 : x
  2. Step 2: Convert to fraction form
    128,043.77/191,970.54 = 61,420.46/x
  3. Step 3: Cross multiply
    128,043.77x = 191,970.54 × 61,420.46
  4. Step 4: Simplify right side
    128,043.77x = 11,790,918,873.25
  5. Step 5: Solve for x
    x = 11,790,918,873.25/128,043.77
  6. Step 6: Final answer
    x = 92,085.06

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1.5x scale

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.