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Finding the Fourth Proportional to 86,571.90, 129,825.45 and 30,390.30

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Solution

The fourth proportional to 86,571.90, 129,825.45 and 30,390.30 is: 45,574.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,571.90 : 129,825.45 = 30,390.30 : x
  2. Step 2: Convert to fraction form
    86,571.90/129,825.45 = 30,390.30/x
  3. Step 3: Cross multiply
    86,571.90x = 129,825.45 × 30,390.30
  4. Step 4: Simplify right side
    86,571.90x = 3,945,434,373.14
  5. Step 5: Solve for x
    x = 3,945,434,373.14/86,571.90
  6. Step 6: Final answer
    x = 45,574.08

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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.