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Finding the Fourth Proportional to 157,911.51, 217,920.74 and 86,294.55

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Solution

The fourth proportional to 157,911.51, 217,920.74 and 86,294.55 is: 119,088.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,911.51 : 217,920.74 = 86,294.55 : x
  2. Step 2: Convert to fraction form
    157,911.51/217,920.74 = 86,294.55/x
  3. Step 3: Cross multiply
    157,911.51x = 217,920.74 × 86,294.55
  4. Step 4: Simplify right side
    157,911.51x = 18,805,371,762.49
  5. Step 5: Solve for x
    x = 18,805,371,762.49/157,911.51
  6. Step 6: Final answer
    x = 119,088.04

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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.