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Finding the Fourth Proportional to 1,442.34, 1,990.53 and 821.34

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Solution

The fourth proportional to 1,442.34, 1,990.53 and 821.34 is: 1,133.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.34 : 1,990.53 = 821.34 : x
  2. Step 2: Convert to fraction form
    1,442.34/1,990.53 = 821.34/x
  3. Step 3: Cross multiply
    1,442.34x = 1,990.53 × 821.34
  4. Step 4: Simplify right side
    1,442.34x = 1,634,901.91
  5. Step 5: Solve for x
    x = 1,634,901.91/1,442.34
  6. Step 6: Final answer
    x = 1,133.51

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Double scale
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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.