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Finding the Fourth Proportional to 85,295.81, 128,054.59 and 65,588.21

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Solution

The fourth proportional to 85,295.81, 128,054.59 and 65,588.21 is: 98,467.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,295.81 : 128,054.59 = 65,588.21 : x
  2. Step 2: Convert to fraction form
    85,295.81/128,054.59 = 65,588.21/x
  3. Step 3: Cross multiply
    85,295.81x = 128,054.59 × 65,588.21
  4. Step 4: Simplify right side
    85,295.81x = 8,398,871,340.38
  5. Step 5: Solve for x
    x = 8,398,871,340.38/85,295.81
  6. Step 6: Final answer
    x = 98,467.57

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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.