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Finding the Fourth Proportional to 98,669.34, 136,117.53 and 64,668.78

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Solution

The fourth proportional to 98,669.34, 136,117.53 and 64,668.78 is: 89,212.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,669.34 : 136,117.53 = 64,668.78 : x
  2. Step 2: Convert to fraction form
    98,669.34/136,117.53 = 64,668.78/x
  3. Step 3: Cross multiply
    98,669.34x = 136,117.53 × 64,668.78
  4. Step 4: Simplify right side
    98,669.34x = 8,802,554,601.71
  5. Step 5: Solve for x
    x = 8,802,554,601.71/98,669.34
  6. Step 6: Final answer
    x = 89,212.66

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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.