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Finding the Fourth Proportional to 280,706.40, 421,059.60 and 162,316.80

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Solution

The fourth proportional to 280,706.40, 421,059.60 and 162,316.80 is: 243,475.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,706.40 : 421,059.60 = 162,316.80 : x
  2. Step 2: Convert to fraction form
    280,706.40/421,059.60 = 162,316.80/x
  3. Step 3: Cross multiply
    280,706.40x = 421,059.60 × 162,316.80
  4. Step 4: Simplify right side
    280,706.40x = 68,345,046,881.28
  5. Step 5: Solve for x
    x = 68,345,046,881.28/280,706.40
  6. Step 6: Final answer
    x = 243,475.20

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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.