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Finding the Fourth Proportional to 821.70, 1,133.76 and 555.66

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Solution

The fourth proportional to 821.70, 1,133.76 and 555.66 is: 766.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.70 : 1,133.76 = 555.66 : x
  2. Step 2: Convert to fraction form
    821.70/1,133.76 = 555.66/x
  3. Step 3: Cross multiply
    821.70x = 1,133.76 × 555.66
  4. Step 4: Simplify right side
    821.70x = 629,985.08
  5. Step 5: Solve for x
    x = 629,985.08/821.70
  6. Step 6: Final answer
    x = 766.69

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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.