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Finding the Fourth Proportional to 528.76, 729.68 and 318.96

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Solution

The fourth proportional to 528.76, 729.68 and 318.96 is: 440.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.76 : 729.68 = 318.96 : x
  2. Step 2: Convert to fraction form
    528.76/729.68 = 318.96/x
  3. Step 3: Cross multiply
    528.76x = 729.68 × 318.96
  4. Step 4: Simplify right side
    528.76x = 232,738.73
  5. Step 5: Solve for x
    x = 232,738.73/528.76
  6. Step 6: Final answer
    x = 440.16

Related Problems

Find fourth proportional to 264.38, 364.84 and 159.48
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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.