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Finding the Fourth Proportional to 1,668.90, 2,303.21 and 1,005.74

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Solution

The fourth proportional to 1,668.90, 2,303.21 and 1,005.74 is: 1,388.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,668.90 : 2,303.21 = 1,005.74 : x
  2. Step 2: Convert to fraction form
    1,668.90/2,303.21 = 1,005.74/x
  3. Step 3: Cross multiply
    1,668.90x = 2,303.21 × 1,005.74
  4. Step 4: Simplify right side
    1,668.90x = 2,316,430.43
  5. Step 5: Solve for x
    x = 2,316,430.43/1,668.90
  6. Step 6: Final answer
    x = 1,388.00

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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.