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Finding the Fourth Proportional to 664.16, 917.70 and 534.20

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Solution

The fourth proportional to 664.16, 917.70 and 534.20 is: 738.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.16 : 917.70 = 534.20 : x
  2. Step 2: Convert to fraction form
    664.16/917.70 = 534.20/x
  3. Step 3: Cross multiply
    664.16x = 917.70 × 534.20
  4. Step 4: Simplify right side
    664.16x = 490,235.34
  5. Step 5: Solve for x
    x = 490,235.34/664.16
  6. Step 6: Final answer
    x = 738.13

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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.