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Finding the Fourth Proportional to 521.03, 718.19 and 381.15

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Solution

The fourth proportional to 521.03, 718.19 and 381.15 is: 525.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.03 : 718.19 = 381.15 : x
  2. Step 2: Convert to fraction form
    521.03/718.19 = 381.15/x
  3. Step 3: Cross multiply
    521.03x = 718.19 × 381.15
  4. Step 4: Simplify right side
    521.03x = 273,736.21
  5. Step 5: Solve for x
    x = 273,736.21/521.03
  6. Step 6: Final answer
    x = 525.38

Related Problems

Find fourth proportional to 260.51, 359.09 and 190.58
Half scale
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Double scale
Find fourth proportional to 522.03, 719.56 and 382.15
Similar ratio
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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.