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Finding the Fourth Proportional to 530.85, 732.75 and 321.21

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Solution

The fourth proportional to 530.85, 732.75 and 321.21 is: 443.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.85 : 732.75 = 321.21 : x
  2. Step 2: Convert to fraction form
    530.85/732.75 = 321.21/x
  3. Step 3: Cross multiply
    530.85x = 732.75 × 321.21
  4. Step 4: Simplify right side
    530.85x = 235,366.63
  5. Step 5: Solve for x
    x = 235,366.63/530.85
  6. Step 6: Final answer
    x = 443.38

Related Problems

Find fourth proportional to 265.43, 366.38 and 160.61
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Double scale
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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.