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Finding the Fourth Proportional to 841.77, 1,161.56 and 620.84

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Solution

The fourth proportional to 841.77, 1,161.56 and 620.84 is: 856.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.77 : 1,161.56 = 620.84 : x
  2. Step 2: Convert to fraction form
    841.77/1,161.56 = 620.84/x
  3. Step 3: Cross multiply
    841.77x = 1,161.56 × 620.84
  4. Step 4: Simplify right side
    841.77x = 721,139.23
  5. Step 5: Solve for x
    x = 721,139.23/841.77
  6. Step 6: Final answer
    x = 856.70

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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.