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Finding the Fourth Proportional to 922.40, 1,376.44 and 840.64

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Solution

The fourth proportional to 922.40, 1,376.44 and 840.64 is: 1,254.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.40 : 1,376.44 = 840.64 : x
  2. Step 2: Convert to fraction form
    922.40/1,376.44 = 840.64/x
  3. Step 3: Cross multiply
    922.40x = 1,376.44 × 840.64
  4. Step 4: Simplify right side
    922.40x = 1,157,090.52
  5. Step 5: Solve for x
    x = 1,157,090.52/922.40
  6. Step 6: Final answer
    x = 1,254.43

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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.