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Finding the Fourth Proportional to 660,668.64, 991,150.59 and 211,416.47

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Solution

The fourth proportional to 660,668.64, 991,150.59 and 211,416.47 is: 317,171.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,668.64 : 991,150.59 = 211,416.47 : x
  2. Step 2: Convert to fraction form
    660,668.64/991,150.59 = 211,416.47/x
  3. Step 3: Cross multiply
    660,668.64x = 991,150.59 × 211,416.47
  4. Step 4: Simplify right side
    660,668.64x = 209,545,554,020.46
  5. Step 5: Solve for x
    x = 209,545,554,020.46/660,668.64
  6. Step 6: Final answer
    x = 317,171.94

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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.