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Finding the Fourth Proportional to 784.56, 1,081.76 and 666.32

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Solution

The fourth proportional to 784.56, 1,081.76 and 666.32 is: 918.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.56 : 1,081.76 = 666.32 : x
  2. Step 2: Convert to fraction form
    784.56/1,081.76 = 666.32/x
  3. Step 3: Cross multiply
    784.56x = 1,081.76 × 666.32
  4. Step 4: Simplify right side
    784.56x = 720,798.32
  5. Step 5: Solve for x
    x = 720,798.32/784.56
  6. Step 6: Final answer
    x = 918.73

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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.