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Finding the Fourth Proportional to 665.21, 918.34 and 508.07

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Solution

The fourth proportional to 665.21, 918.34 and 508.07 is: 701.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.21 : 918.34 = 508.07 : x
  2. Step 2: Convert to fraction form
    665.21/918.34 = 508.07/x
  3. Step 3: Cross multiply
    665.21x = 918.34 × 508.07
  4. Step 4: Simplify right side
    665.21x = 466,582.03
  5. Step 5: Solve for x
    x = 466,582.03/665.21
  6. Step 6: Final answer
    x = 701.40

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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.