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Finding the Fourth Proportional to 485,869.94, 670,471.62 and 281,905.06

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Solution

The fourth proportional to 485,869.94, 670,471.62 and 281,905.06 is: 389,012.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,869.94 : 670,471.62 = 281,905.06 : x
  2. Step 2: Convert to fraction form
    485,869.94/670,471.62 = 281,905.06/x
  3. Step 3: Cross multiply
    485,869.94x = 670,471.62 × 281,905.06
  4. Step 4: Simplify right side
    485,869.94x = 189,009,342,264.40
  5. Step 5: Solve for x
    x = 189,009,342,264.40/485,869.94
  6. Step 6: Final answer
    x = 389,012.22

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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.