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Finding the Fourth Proportional to 145,978.40, 218,530.20 and 86,783.60

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Solution

The fourth proportional to 145,978.40, 218,530.20 and 86,783.60 is: 129,915.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,978.40 : 218,530.20 = 86,783.60 : x
  2. Step 2: Convert to fraction form
    145,978.40/218,530.20 = 86,783.60/x
  3. Step 3: Cross multiply
    145,978.40x = 218,530.20 × 86,783.60
  4. Step 4: Simplify right side
    145,978.40x = 18,964,837,464.72
  5. Step 5: Solve for x
    x = 18,964,837,464.72/145,978.40
  6. Step 6: Final answer
    x = 129,915.37

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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.