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Finding the Fourth Proportional to 784.28, 1,176.42 and 297.07

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Solution

The fourth proportional to 784.28, 1,176.42 and 297.07 is: 445.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.28 : 1,176.42 = 297.07 : x
  2. Step 2: Convert to fraction form
    784.28/1,176.42 = 297.07/x
  3. Step 3: Cross multiply
    784.28x = 1,176.42 × 297.07
  4. Step 4: Simplify right side
    784.28x = 349,479.09
  5. Step 5: Solve for x
    x = 349,479.09/784.28
  6. Step 6: Final answer
    x = 445.61

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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.