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Finding the Fourth Proportional to 926.51, 1,389.75 and 668.16

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Solution

The fourth proportional to 926.51, 1,389.75 and 668.16 is: 1,002.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.51 : 1,389.75 = 668.16 : x
  2. Step 2: Convert to fraction form
    926.51/1,389.75 = 668.16/x
  3. Step 3: Cross multiply
    926.51x = 1,389.75 × 668.16
  4. Step 4: Simplify right side
    926.51x = 928,572.85
  5. Step 5: Solve for x
    x = 928,572.85/926.51
  6. Step 6: Final answer
    x = 1,002.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.