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Finding the Fourth Proportional to 153,405, 211,718.34 and 86,349.96

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Solution

The fourth proportional to 153,405, 211,718.34 and 86,349.96 is: 119,173.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,405 : 211,718.34 = 86,349.96 : x
  2. Step 2: Convert to fraction form
    153,405/211,718.34 = 86,349.96/x
  3. Step 3: Cross multiply
    153,405x = 211,718.34 × 86,349.96
  4. Step 4: Simplify right side
    153,405x = 18,281,870,190.27
  5. Step 5: Solve for x
    x = 18,281,870,190.27/153,405
  6. Step 6: Final answer
    x = 119,173.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.