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Finding the Fourth Proportional to 86,821.60, 130,232.40 and 31,410.40

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Solution

The fourth proportional to 86,821.60, 130,232.40 and 31,410.40 is: 47,115.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,821.60 : 130,232.40 = 31,410.40 : x
  2. Step 2: Convert to fraction form
    86,821.60/130,232.40 = 31,410.40/x
  3. Step 3: Cross multiply
    86,821.60x = 130,232.40 × 31,410.40
  4. Step 4: Simplify right side
    86,821.60x = 4,090,651,776.96
  5. Step 5: Solve for x
    x = 4,090,651,776.96/86,821.60
  6. Step 6: Final answer
    x = 47,115.60

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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.