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Finding the Fourth Proportional to 438,669.87, 605,368.59 and 257,384.88

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Solution

The fourth proportional to 438,669.87, 605,368.59 and 257,384.88 is: 355,193.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,669.87 : 605,368.59 = 257,384.88 : x
  2. Step 2: Convert to fraction form
    438,669.87/605,368.59 = 257,384.88/x
  3. Step 3: Cross multiply
    438,669.87x = 605,368.59 × 257,384.88
  4. Step 4: Simplify right side
    438,669.87x = 155,812,721,892.92
  5. Step 5: Solve for x
    x = 155,812,721,892.92/438,669.87
  6. Step 6: Final answer
    x = 355,193.58

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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.