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Finding the Fourth Proportional to 784.01, 1,081.55 and 518.94

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Solution

The fourth proportional to 784.01, 1,081.55 and 518.94 is: 715.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.01 : 1,081.55 = 518.94 : x
  2. Step 2: Convert to fraction form
    784.01/1,081.55 = 518.94/x
  3. Step 3: Cross multiply
    784.01x = 1,081.55 × 518.94
  4. Step 4: Simplify right side
    784.01x = 561,260.85
  5. Step 5: Solve for x
    x = 561,260.85/784.01
  6. Step 6: Final answer
    x = 715.88

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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.