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Finding the Fourth Proportional to 85,480.68, 128,106.39 and 66,528.19

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Solution

The fourth proportional to 85,480.68, 128,106.39 and 66,528.19 is: 99,703.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,480.68 : 128,106.39 = 66,528.19 : x
  2. Step 2: Convert to fraction form
    85,480.68/128,106.39 = 66,528.19/x
  3. Step 3: Cross multiply
    85,480.68x = 128,106.39 × 66,528.19
  4. Step 4: Simplify right side
    85,480.68x = 8,522,686,743.38
  5. Step 5: Solve for x
    x = 8,522,686,743.38/85,480.68
  6. Step 6: Final answer
    x = 99,703.08

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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.