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Finding the Fourth Proportional to 153,781.83, 212,220.68 and 86,713.83

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Solution

The fourth proportional to 153,781.83, 212,220.68 and 86,713.83 is: 119,666.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,781.83 : 212,220.68 = 86,713.83 : x
  2. Step 2: Convert to fraction form
    153,781.83/212,220.68 = 86,713.83/x
  3. Step 3: Cross multiply
    153,781.83x = 212,220.68 × 86,713.83
  4. Step 4: Simplify right side
    153,781.83x = 18,402,467,534.44
  5. Step 5: Solve for x
    x = 18,402,467,534.44/153,781.83
  6. Step 6: Final answer
    x = 119,666.07

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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.