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Finding the Fourth Proportional to 86,803.60, 130,205.40 and 21,139.60

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Solution

The fourth proportional to 86,803.60, 130,205.40 and 21,139.60 is: 31,709.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,803.60 : 130,205.40 = 21,139.60 : x
  2. Step 2: Convert to fraction form
    86,803.60/130,205.40 = 21,139.60/x
  3. Step 3: Cross multiply
    86,803.60x = 130,205.40 × 21,139.60
  4. Step 4: Simplify right side
    86,803.60x = 2,752,490,073.84
  5. Step 5: Solve for x
    x = 2,752,490,073.84/86,803.60
  6. Step 6: Final answer
    x = 31,709.40

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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.