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Finding the Fourth Proportional to 86,415.40, 129,623.10 and 80,583.40

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Solution

The fourth proportional to 86,415.40, 129,623.10 and 80,583.40 is: 120,875.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,415.40 : 129,623.10 = 80,583.40 : x
  2. Step 2: Convert to fraction form
    86,415.40/129,623.10 = 80,583.40/x
  3. Step 3: Cross multiply
    86,415.40x = 129,623.10 × 80,583.40
  4. Step 4: Simplify right side
    86,415.40x = 10,445,470,116.54
  5. Step 5: Solve for x
    x = 10,445,470,116.54/86,415.40
  6. Step 6: Final answer
    x = 120,875.10

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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.