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Finding the Fourth Proportional to 128,683.34, 177,582.75 and 72,093.50

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Solution

The fourth proportional to 128,683.34, 177,582.75 and 72,093.50 is: 99,488.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,683.34 : 177,582.75 = 72,093.50 : x
  2. Step 2: Convert to fraction form
    128,683.34/177,582.75 = 72,093.50/x
  3. Step 3: Cross multiply
    128,683.34x = 177,582.75 × 72,093.50
  4. Step 4: Simplify right side
    128,683.34x = 12,802,561,987.13
  5. Step 5: Solve for x
    x = 12,802,561,987.13/128,683.34
  6. Step 6: Final answer
    x = 99,488.88

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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.