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Finding the Fourth Proportional to 149,136.76, 205,802.67 and 85,430.26

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Solution

The fourth proportional to 149,136.76, 205,802.67 and 85,430.26 is: 117,890.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,136.76 : 205,802.67 = 85,430.26 : x
  2. Step 2: Convert to fraction form
    149,136.76/205,802.67 = 85,430.26/x
  3. Step 3: Cross multiply
    149,136.76x = 205,802.67 × 85,430.26
  4. Step 4: Simplify right side
    149,136.76x = 17,581,775,606.79
  5. Step 5: Solve for x
    x = 17,581,775,606.79/149,136.76
  6. Step 6: Final answer
    x = 117,890.29

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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.