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Finding the Fourth Proportional to 211,706.80, 317,099.40 and 128,455.60

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Solution

The fourth proportional to 211,706.80, 317,099.40 and 128,455.60 is: 192,403.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,706.80 : 317,099.40 = 128,455.60 : x
  2. Step 2: Convert to fraction form
    211,706.80/317,099.40 = 128,455.60/x
  3. Step 3: Cross multiply
    211,706.80x = 317,099.40 × 128,455.60
  4. Step 4: Simplify right side
    211,706.80x = 40,733,193,686.64
  5. Step 5: Solve for x
    x = 40,733,193,686.64/211,706.80
  6. Step 6: Final answer
    x = 192,403.80

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1.5x scale

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.