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Finding the Fourth Proportional to 665.95, 920.13 and 479.07

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Solution

The fourth proportional to 665.95, 920.13 and 479.07 is: 661.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.95 : 920.13 = 479.07 : x
  2. Step 2: Convert to fraction form
    665.95/920.13 = 479.07/x
  3. Step 3: Cross multiply
    665.95x = 920.13 × 479.07
  4. Step 4: Simplify right side
    665.95x = 440,803.28
  5. Step 5: Solve for x
    x = 440,803.28/665.95
  6. Step 6: Final answer
    x = 661.92

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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.