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Finding the Fourth Proportional to 1,420.20, 1,959.12 and 922.32

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Solution

The fourth proportional to 1,420.20, 1,959.12 and 922.32 is: 1,272.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.20 : 1,959.12 = 922.32 : x
  2. Step 2: Convert to fraction form
    1,420.20/1,959.12 = 922.32/x
  3. Step 3: Cross multiply
    1,420.20x = 1,959.12 × 922.32
  4. Step 4: Simplify right side
    1,420.20x = 1,806,935.56
  5. Step 5: Solve for x
    x = 1,806,935.56/1,420.20
  6. Step 6: Final answer
    x = 1,272.31

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1.5x scale

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.