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Finding the Fourth Proportional to 153,803.45, 212,249.27 and 85,819.18

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Solution

The fourth proportional to 153,803.45, 212,249.27 and 85,819.18 is: 118,430.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,803.45 : 212,249.27 = 85,819.18 : x
  2. Step 2: Convert to fraction form
    153,803.45/212,249.27 = 85,819.18/x
  3. Step 3: Cross multiply
    153,803.45x = 212,249.27 × 85,819.18
  4. Step 4: Simplify right side
    153,803.45x = 18,215,058,307.00
  5. Step 5: Solve for x
    x = 18,215,058,307.00/153,803.45
  6. Step 6: Final answer
    x = 118,430.75

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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.