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Finding the Fourth Proportional to 666.47, 919.59 and 478.01

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Solution

The fourth proportional to 666.47, 919.59 and 478.01 is: 659.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.47 : 919.59 = 478.01 : x
  2. Step 2: Convert to fraction form
    666.47/919.59 = 478.01/x
  3. Step 3: Cross multiply
    666.47x = 919.59 × 478.01
  4. Step 4: Simplify right side
    666.47x = 439,573.72
  5. Step 5: Solve for x
    x = 439,573.72/666.47
  6. Step 6: Final answer
    x = 659.55

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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.