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Finding the Fourth Proportional to 86,571.40, 129,881.40 and 42,199.60

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Solution

The fourth proportional to 86,571.40, 129,881.40 and 42,199.60 is: 63,311.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,571.40 : 129,881.40 = 42,199.60 : x
  2. Step 2: Convert to fraction form
    86,571.40/129,881.40 = 42,199.60/x
  3. Step 3: Cross multiply
    86,571.40x = 129,881.40 × 42,199.60
  4. Step 4: Simplify right side
    86,571.40x = 5,480,943,127.44
  5. Step 5: Solve for x
    x = 5,480,943,127.44/86,571.40
  6. Step 6: Final answer
    x = 63,311.25

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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.