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Finding the Fourth Proportional to 901.68, 1,347.92 and 668.40

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Solution

The fourth proportional to 901.68, 1,347.92 and 668.40 is: 999.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.68 : 1,347.92 = 668.40 : x
  2. Step 2: Convert to fraction form
    901.68/1,347.92 = 668.40/x
  3. Step 3: Cross multiply
    901.68x = 1,347.92 × 668.40
  4. Step 4: Simplify right side
    901.68x = 900,946.39
  5. Step 5: Solve for x
    x = 900,946.39/901.68
  6. Step 6: Final answer
    x = 999.19

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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.