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Finding the Fourth Proportional to 85,853.70, 128,790.15 and 26,688.90

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Solution

The fourth proportional to 85,853.70, 128,790.15 and 26,688.90 is: 40,036.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,853.70 : 128,790.15 = 26,688.90 : x
  2. Step 2: Convert to fraction form
    85,853.70/128,790.15 = 26,688.90/x
  3. Step 3: Cross multiply
    85,853.70x = 128,790.15 × 26,688.90
  4. Step 4: Simplify right side
    85,853.70x = 3,437,267,434.34
  5. Step 5: Solve for x
    x = 3,437,267,434.34/85,853.70
  6. Step 6: Final answer
    x = 40,036.33

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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.