Home / 145,830.40-218,308.20-86,635.60

Finding the Fourth Proportional to 145,830.40, 218,308.20 and 86,635.60

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Solution

The fourth proportional to 145,830.40, 218,308.20 and 86,635.60 is: 129,693.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,830.40 : 218,308.20 = 86,635.60 : x
  2. Step 2: Convert to fraction form
    145,830.40/218,308.20 = 86,635.60/x
  3. Step 3: Cross multiply
    145,830.40x = 218,308.20 × 86,635.60
  4. Step 4: Simplify right side
    145,830.40x = 18,913,261,891.92
  5. Step 5: Solve for x
    x = 18,913,261,891.92/145,830.40
  6. Step 6: Final answer
    x = 129,693.55

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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.