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Finding the Fourth Proportional to 784.30, 1,176.40 and 236.47

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Solution

The fourth proportional to 784.30, 1,176.40 and 236.47 is: 354.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.30 : 1,176.40 = 236.47 : x
  2. Step 2: Convert to fraction form
    784.30/1,176.40 = 236.47/x
  3. Step 3: Cross multiply
    784.30x = 1,176.40 × 236.47
  4. Step 4: Simplify right side
    784.30x = 278,183.31
  5. Step 5: Solve for x
    x = 278,183.31/784.30
  6. Step 6: Final answer
    x = 354.69

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.