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Finding the Fourth Proportional to 518.32, 714.19 and 490.72

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Solution

The fourth proportional to 518.32, 714.19 and 490.72 is: 676.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.32 : 714.19 = 490.72 : x
  2. Step 2: Convert to fraction form
    518.32/714.19 = 490.72/x
  3. Step 3: Cross multiply
    518.32x = 714.19 × 490.72
  4. Step 4: Simplify right side
    518.32x = 350,467.32
  5. Step 5: Solve for x
    x = 350,467.32/518.32
  6. Step 6: Final answer
    x = 676.16

Related Problems

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Half scale
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Double scale
Find fourth proportional to 519.32, 715.57 and 491.72
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.