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Finding the Fourth Proportional to 128,485.99, 177,346.56 and 74,781.37

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Solution

The fourth proportional to 128,485.99, 177,346.56 and 74,781.37 is: 103,219.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,485.99 : 177,346.56 = 74,781.37 : x
  2. Step 2: Convert to fraction form
    128,485.99/177,346.56 = 74,781.37/x
  3. Step 3: Cross multiply
    128,485.99x = 177,346.56 × 74,781.37
  4. Step 4: Simplify right side
    128,485.99x = 13,262,218,721.59
  5. Step 5: Solve for x
    x = 13,262,218,721.59/128,485.99
  6. Step 6: Final answer
    x = 103,219.18

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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.