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Finding the Fourth Proportional to 551.34, 760.32 and 420.12

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Solution

The fourth proportional to 551.34, 760.32 and 420.12 is: 579.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.34 : 760.32 = 420.12 : x
  2. Step 2: Convert to fraction form
    551.34/760.32 = 420.12/x
  3. Step 3: Cross multiply
    551.34x = 760.32 × 420.12
  4. Step 4: Simplify right side
    551.34x = 319,425.64
  5. Step 5: Solve for x
    x = 319,425.64/551.34
  6. Step 6: Final answer
    x = 579.36

Related Problems

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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.