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Finding the Fourth Proportional to 528.24, 728.76 and 320.88

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Solution

The fourth proportional to 528.24, 728.76 and 320.88 is: 442.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.24 : 728.76 = 320.88 : x
  2. Step 2: Convert to fraction form
    528.24/728.76 = 320.88/x
  3. Step 3: Cross multiply
    528.24x = 728.76 × 320.88
  4. Step 4: Simplify right side
    528.24x = 233,844.51
  5. Step 5: Solve for x
    x = 233,844.51/528.24
  6. Step 6: Final answer
    x = 442.69

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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.