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Finding the Fourth Proportional to 528.35, 728.65 and 440.12

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Solution

The fourth proportional to 528.35, 728.65 and 440.12 is: 606.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.35 : 728.65 = 440.12 : x
  2. Step 2: Convert to fraction form
    528.35/728.65 = 440.12/x
  3. Step 3: Cross multiply
    528.35x = 728.65 × 440.12
  4. Step 4: Simplify right side
    528.35x = 320,697.18
  5. Step 5: Solve for x
    x = 320,697.18/528.35
  6. Step 6: Final answer
    x = 606.98

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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.