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Finding the Fourth Proportional to 505.13, 697.59 and 380.59

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Solution

The fourth proportional to 505.13, 697.59 and 380.59 is: 525.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.13 : 697.59 = 380.59 : x
  2. Step 2: Convert to fraction form
    505.13/697.59 = 380.59/x
  3. Step 3: Cross multiply
    505.13x = 697.59 × 380.59
  4. Step 4: Simplify right side
    505.13x = 265,495.78
  5. Step 5: Solve for x
    x = 265,495.78/505.13
  6. Step 6: Final answer
    x = 525.60

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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.