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Finding the Fourth Proportional to 449.16, 619.26 and 386.76

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Solution

The fourth proportional to 449.16, 619.26 and 386.76 is: 533.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.16 : 619.26 = 386.76 : x
  2. Step 2: Convert to fraction form
    449.16/619.26 = 386.76/x
  3. Step 3: Cross multiply
    449.16x = 619.26 × 386.76
  4. Step 4: Simplify right side
    449.16x = 239,505.00
  5. Step 5: Solve for x
    x = 239,505.00/449.16
  6. Step 6: Final answer
    x = 533.23

Related Problems

Find fourth proportional to 224.58, 309.63 and 193.38
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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.