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Finding the Fourth Proportional to 821.34, 1,133.55 and 489.77

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Solution

The fourth proportional to 821.34, 1,133.55 and 489.77 is: 675.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.34 : 1,133.55 = 489.77 : x
  2. Step 2: Convert to fraction form
    821.34/1,133.55 = 489.77/x
  3. Step 3: Cross multiply
    821.34x = 1,133.55 × 489.77
  4. Step 4: Simplify right side
    821.34x = 555,173.12
  5. Step 5: Solve for x
    x = 555,173.12/821.34
  6. Step 6: Final answer
    x = 675.94

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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.