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Finding the Fourth Proportional to 85,707.51, 128,512.01 and 45,677.22

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Solution

The fourth proportional to 85,707.51, 128,512.01 and 45,677.22 is: 68,489.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,707.51 : 128,512.01 = 45,677.22 : x
  2. Step 2: Convert to fraction form
    85,707.51/128,512.01 = 45,677.22/x
  3. Step 3: Cross multiply
    85,707.51x = 128,512.01 × 45,677.22
  4. Step 4: Simplify right side
    85,707.51x = 5,870,071,125.03
  5. Step 5: Solve for x
    x = 5,870,071,125.03/85,707.51
  6. Step 6: Final answer
    x = 68,489.58

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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.