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Finding the Fourth Proportional to 978.21, 1,467.18 and 921.06

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Solution

The fourth proportional to 978.21, 1,467.18 and 921.06 is: 1,381.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.21 : 1,467.18 = 921.06 : x
  2. Step 2: Convert to fraction form
    978.21/1,467.18 = 921.06/x
  3. Step 3: Cross multiply
    978.21x = 1,467.18 × 921.06
  4. Step 4: Simplify right side
    978.21x = 1,351,360.81
  5. Step 5: Solve for x
    x = 1,351,360.81/978.21
  6. Step 6: Final answer
    x = 1,381.46

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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.