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Finding the Fourth Proportional to 538,653.61, 742,405.65 and 393,220.13

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Solution

The fourth proportional to 538,653.61, 742,405.65 and 393,220.13 is: 541,960.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    538,653.61 : 742,405.65 = 393,220.13 : x
  2. Step 2: Convert to fraction form
    538,653.61/742,405.65 = 393,220.13/x
  3. Step 3: Cross multiply
    538,653.61x = 742,405.65 × 393,220.13
  4. Step 4: Simplify right side
    538,653.61x = 291,928,846,205.74
  5. Step 5: Solve for x
    x = 291,928,846,205.74/538,653.61
  6. Step 6: Final answer
    x = 541,960.26

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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.