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Finding the Fourth Proportional to 1,210.71, 1,666.91 and 1,055.39

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Solution

The fourth proportional to 1,210.71, 1,666.91 and 1,055.39 is: 1,453.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.71 : 1,666.91 = 1,055.39 : x
  2. Step 2: Convert to fraction form
    1,210.71/1,666.91 = 1,055.39/x
  3. Step 3: Cross multiply
    1,210.71x = 1,666.91 × 1,055.39
  4. Step 4: Simplify right side
    1,210.71x = 1,759,240.14
  5. Step 5: Solve for x
    x = 1,759,240.14/1,210.71
  6. Step 6: Final answer
    x = 1,453.06

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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.