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Finding the Fourth Proportional to 505.15, 697.20 and 284.18

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Solution

The fourth proportional to 505.15, 697.20 and 284.18 is: 392.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.15 : 697.20 = 284.18 : x
  2. Step 2: Convert to fraction form
    505.15/697.20 = 284.18/x
  3. Step 3: Cross multiply
    505.15x = 697.20 × 284.18
  4. Step 4: Simplify right side
    505.15x = 198,130.30
  5. Step 5: Solve for x
    x = 198,130.30/505.15
  6. Step 6: Final answer
    x = 392.22

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Double scale
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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.