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Finding the Fourth Proportional to 505.16, 692.08 and 485.72

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Solution

The fourth proportional to 505.16, 692.08 and 485.72 is: 665.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.16 : 692.08 = 485.72 : x
  2. Step 2: Convert to fraction form
    505.16/692.08 = 485.72/x
  3. Step 3: Cross multiply
    505.16x = 692.08 × 485.72
  4. Step 4: Simplify right side
    505.16x = 336,157.10
  5. Step 5: Solve for x
    x = 336,157.10/505.16
  6. Step 6: Final answer
    x = 665.45

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.