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Finding the Fourth Proportional to 904.09, 1,247.55 and 505.72

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Solution

The fourth proportional to 904.09, 1,247.55 and 505.72 is: 697.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.09 : 1,247.55 = 505.72 : x
  2. Step 2: Convert to fraction form
    904.09/1,247.55 = 505.72/x
  3. Step 3: Cross multiply
    904.09x = 1,247.55 × 505.72
  4. Step 4: Simplify right side
    904.09x = 630,910.99
  5. Step 5: Solve for x
    x = 630,910.99/904.09
  6. Step 6: Final answer
    x = 697.84

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Double scale
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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.