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Finding the Fourth Proportional to 86,820.10, 130,230.15 and 21,156.10

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Solution

The fourth proportional to 86,820.10, 130,230.15 and 21,156.10 is: 31,734.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,820.10 : 130,230.15 = 21,156.10 : x
  2. Step 2: Convert to fraction form
    86,820.10/130,230.15 = 21,156.10/x
  3. Step 3: Cross multiply
    86,820.10x = 130,230.15 × 21,156.10
  4. Step 4: Simplify right side
    86,820.10x = 2,755,162,076.42
  5. Step 5: Solve for x
    x = 2,755,162,076.42/86,820.10
  6. Step 6: Final answer
    x = 31,734.15

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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.