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Finding the Fourth Proportional to 1,055.81, 1,574.72 and 989.66

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Solution

The fourth proportional to 1,055.81, 1,574.72 and 989.66 is: 1,476.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.81 : 1,574.72 = 989.66 : x
  2. Step 2: Convert to fraction form
    1,055.81/1,574.72 = 989.66/x
  3. Step 3: Cross multiply
    1,055.81x = 1,574.72 × 989.66
  4. Step 4: Simplify right side
    1,055.81x = 1,558,437.40
  5. Step 5: Solve for x
    x = 1,558,437.40/1,055.81
  6. Step 6: Final answer
    x = 1,476.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.