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Finding the Fourth Proportional to 287,644.79, 431,315.21 and 127,651.23

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Solution

The fourth proportional to 287,644.79, 431,315.21 and 127,651.23 is: 191,409.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,644.79 : 431,315.21 = 127,651.23 : x
  2. Step 2: Convert to fraction form
    287,644.79/431,315.21 = 127,651.23/x
  3. Step 3: Cross multiply
    287,644.79x = 431,315.21 × 127,651.23
  4. Step 4: Simplify right side
    287,644.79x = 55,057,917,393.34
  5. Step 5: Solve for x
    x = 55,057,917,393.34/287,644.79
  6. Step 6: Final answer
    x = 191,409.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.