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Finding the Fourth Proportional to 480.94, 725.19 and 390.72

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Solution

The fourth proportional to 480.94, 725.19 and 390.72 is: 589.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.94 : 725.19 = 390.72 : x
  2. Step 2: Convert to fraction form
    480.94/725.19 = 390.72/x
  3. Step 3: Cross multiply
    480.94x = 725.19 × 390.72
  4. Step 4: Simplify right side
    480.94x = 283,349.14
  5. Step 5: Solve for x
    x = 283,349.14/480.94
  6. Step 6: Final answer
    x = 589.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.