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Finding the Fourth Proportional to 218,730.40, 328,095.60 and 70,986.40

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Solution

The fourth proportional to 218,730.40, 328,095.60 and 70,986.40 is: 106,479.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,730.40 : 328,095.60 = 70,986.40 : x
  2. Step 2: Convert to fraction form
    218,730.40/328,095.60 = 70,986.40/x
  3. Step 3: Cross multiply
    218,730.40x = 328,095.60 × 70,986.40
  4. Step 4: Simplify right side
    218,730.40x = 23,290,325,499.84
  5. Step 5: Solve for x
    x = 23,290,325,499.84/218,730.40
  6. Step 6: Final answer
    x = 106,479.60

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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.