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Finding the Fourth Proportional to 764.91, 1,055.43 and 485.19

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Solution

The fourth proportional to 764.91, 1,055.43 and 485.19 is: 669.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.91 : 1,055.43 = 485.19 : x
  2. Step 2: Convert to fraction form
    764.91/1,055.43 = 485.19/x
  3. Step 3: Cross multiply
    764.91x = 1,055.43 × 485.19
  4. Step 4: Simplify right side
    764.91x = 512,084.08
  5. Step 5: Solve for x
    x = 512,084.08/764.91
  6. Step 6: Final answer
    x = 669.47

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Double scale
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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.