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Finding the Fourth Proportional to 1,455.80, 2,009.43 and 990.32

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Solution

The fourth proportional to 1,455.80, 2,009.43 and 990.32 is: 1,366.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.80 : 2,009.43 = 990.32 : x
  2. Step 2: Convert to fraction form
    1,455.80/2,009.43 = 990.32/x
  3. Step 3: Cross multiply
    1,455.80x = 2,009.43 × 990.32
  4. Step 4: Simplify right side
    1,455.80x = 1,989,978.72
  5. Step 5: Solve for x
    x = 1,989,978.72/1,455.80
  6. Step 6: Final answer
    x = 1,366.93

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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.