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Finding the Fourth Proportional to 86,340.36, 129,510.54 and 81,467.40

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Solution

The fourth proportional to 86,340.36, 129,510.54 and 81,467.40 is: 122,201.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,340.36 : 129,510.54 = 81,467.40 : x
  2. Step 2: Convert to fraction form
    86,340.36/129,510.54 = 81,467.40/x
  3. Step 3: Cross multiply
    86,340.36x = 129,510.54 × 81,467.40
  4. Step 4: Simplify right side
    86,340.36x = 10,550,886,966.40
  5. Step 5: Solve for x
    x = 10,550,886,966.40/86,340.36
  6. Step 6: Final answer
    x = 122,201.10

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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.