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Finding the Fourth Proportional to 128,976.47, 177,967.62 and 73,781.45

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Solution

The fourth proportional to 128,976.47, 177,967.62 and 73,781.45 is: 101,807.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,976.47 : 177,967.62 = 73,781.45 : x
  2. Step 2: Convert to fraction form
    128,976.47/177,967.62 = 73,781.45/x
  3. Step 3: Cross multiply
    128,976.47x = 177,967.62 × 73,781.45
  4. Step 4: Simplify right side
    128,976.47x = 13,130,708,166.81
  5. Step 5: Solve for x
    x = 13,130,708,166.81/128,976.47
  6. Step 6: Final answer
    x = 101,807.01

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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.