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Finding the Fourth Proportional to 1,379.32, 1,905.96 and 985.66

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Solution

The fourth proportional to 1,379.32, 1,905.96 and 985.66 is: 1,362.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.32 : 1,905.96 = 985.66 : x
  2. Step 2: Convert to fraction form
    1,379.32/1,905.96 = 985.66/x
  3. Step 3: Cross multiply
    1,379.32x = 1,905.96 × 985.66
  4. Step 4: Simplify right side
    1,379.32x = 1,878,628.53
  5. Step 5: Solve for x
    x = 1,878,628.53/1,379.32
  6. Step 6: Final answer
    x = 1,362.00

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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.