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Finding the Fourth Proportional to 486,912.40, 730,368.60 and 131,970.40

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Solution

The fourth proportional to 486,912.40, 730,368.60 and 131,970.40 is: 197,955.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,912.40 : 730,368.60 = 131,970.40 : x
  2. Step 2: Convert to fraction form
    486,912.40/730,368.60 = 131,970.40/x
  3. Step 3: Cross multiply
    486,912.40x = 730,368.60 × 131,970.40
  4. Step 4: Simplify right side
    486,912.40x = 96,387,036,289.44
  5. Step 5: Solve for x
    x = 96,387,036,289.44/486,912.40
  6. Step 6: Final answer
    x = 197,955.60

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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.