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Finding the Fourth Proportional to 86,574.80, 129,959.40 and 66,940.40

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Solution

The fourth proportional to 86,574.80, 129,959.40 and 66,940.40 is: 100,485.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,574.80 : 129,959.40 = 66,940.40 : x
  2. Step 2: Convert to fraction form
    86,574.80/129,959.40 = 66,940.40/x
  3. Step 3: Cross multiply
    86,574.80x = 129,959.40 × 66,940.40
  4. Step 4: Simplify right side
    86,574.80x = 8,699,534,219.76
  5. Step 5: Solve for x
    x = 8,699,534,219.76/86,574.80
  6. Step 6: Final answer
    x = 100,485.76

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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.