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Finding the Fourth Proportional to 643,258.76, 887,803.35 and 356,871.11

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Solution

The fourth proportional to 643,258.76, 887,803.35 and 356,871.11 is: 492,541.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,258.76 : 887,803.35 = 356,871.11 : x
  2. Step 2: Convert to fraction form
    643,258.76/887,803.35 = 356,871.11/x
  3. Step 3: Cross multiply
    643,258.76x = 887,803.35 × 356,871.11
  4. Step 4: Simplify right side
    643,258.76x = 316,831,366,976.22
  5. Step 5: Solve for x
    x = 316,831,366,976.22/643,258.76
  6. Step 6: Final answer
    x = 492,541.08

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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.