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Finding the Fourth Proportional to 491.99, 738.26 and 420.17

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Solution

The fourth proportional to 491.99, 738.26 and 420.17 is: 630.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.99 : 738.26 = 420.17 : x
  2. Step 2: Convert to fraction form
    491.99/738.26 = 420.17/x
  3. Step 3: Cross multiply
    491.99x = 738.26 × 420.17
  4. Step 4: Simplify right side
    491.99x = 310,192.60
  5. Step 5: Solve for x
    x = 310,192.60/491.99
  6. Step 6: Final answer
    x = 630.49

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.