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Finding the Fourth Proportional to 903.80, 1,247.10 and 505.49

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Solution

The fourth proportional to 903.80, 1,247.10 and 505.49 is: 697.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.80 : 1,247.10 = 505.49 : x
  2. Step 2: Convert to fraction form
    903.80/1,247.10 = 505.49/x
  3. Step 3: Cross multiply
    903.80x = 1,247.10 × 505.49
  4. Step 4: Simplify right side
    903.80x = 630,394.72
  5. Step 5: Solve for x
    x = 630,394.72/903.80
  6. Step 6: Final answer
    x = 697.49

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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.