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Finding the Fourth Proportional to 85,868.21, 128,820.54 and 25,898.51

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Solution

The fourth proportional to 85,868.21, 128,820.54 and 25,898.51 is: 38,853.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,868.21 : 128,820.54 = 25,898.51 : x
  2. Step 2: Convert to fraction form
    85,868.21/128,820.54 = 25,898.51/x
  3. Step 3: Cross multiply
    85,868.21x = 128,820.54 × 25,898.51
  4. Step 4: Simplify right side
    85,868.21x = 3,336,260,043.40
  5. Step 5: Solve for x
    x = 3,336,260,043.40/85,868.21
  6. Step 6: Final answer
    x = 38,853.26

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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.