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Finding the Fourth Proportional to 153,991.40, 212,507.70 and 86,923.40

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Solution

The fourth proportional to 153,991.40, 212,507.70 and 86,923.40 is: 119,954.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,991.40 : 212,507.70 = 86,923.40 : x
  2. Step 2: Convert to fraction form
    153,991.40/212,507.70 = 86,923.40/x
  3. Step 3: Cross multiply
    153,991.40x = 212,507.70 × 86,923.40
  4. Step 4: Simplify right side
    153,991.40x = 18,471,891,810.18
  5. Step 5: Solve for x
    x = 18,471,891,810.18/153,991.40
  6. Step 6: Final answer
    x = 119,954.05

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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.