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Finding the Fourth Proportional to 784.77, 1,176.21 and 460.23

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Solution

The fourth proportional to 784.77, 1,176.21 and 460.23 is: 689.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.77 : 1,176.21 = 460.23 : x
  2. Step 2: Convert to fraction form
    784.77/1,176.21 = 460.23/x
  3. Step 3: Cross multiply
    784.77x = 1,176.21 × 460.23
  4. Step 4: Simplify right side
    784.77x = 541,327.13
  5. Step 5: Solve for x
    x = 541,327.13/784.77
  6. Step 6: Final answer
    x = 689.79

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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.