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Finding the Fourth Proportional to 85,817.80, 128,726.70 and 43,827.40

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Solution

The fourth proportional to 85,817.80, 128,726.70 and 43,827.40 is: 65,741.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,817.80 : 128,726.70 = 43,827.40 : x
  2. Step 2: Convert to fraction form
    85,817.80/128,726.70 = 43,827.40/x
  3. Step 3: Cross multiply
    85,817.80x = 128,726.70 × 43,827.40
  4. Step 4: Simplify right side
    85,817.80x = 5,641,756,571.58
  5. Step 5: Solve for x
    x = 5,641,756,571.58/85,817.80
  6. Step 6: Final answer
    x = 65,741.10

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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.