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Finding the Fourth Proportional to 528.12, 786.87 and 495

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Solution

The fourth proportional to 528.12, 786.87 and 495 is: 737.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.12 : 786.87 = 495 : x
  2. Step 2: Convert to fraction form
    528.12/786.87 = 495/x
  3. Step 3: Cross multiply
    528.12x = 786.87 × 495
  4. Step 4: Simplify right side
    528.12x = 389,500.65
  5. Step 5: Solve for x
    x = 389,500.65/528.12
  6. Step 6: Final answer
    x = 737.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.