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Finding the Fourth Proportional to 478.12, 659.72 and 347.18

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Solution

The fourth proportional to 478.12, 659.72 and 347.18 is: 479.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.12 : 659.72 = 347.18 : x
  2. Step 2: Convert to fraction form
    478.12/659.72 = 347.18/x
  3. Step 3: Cross multiply
    478.12x = 659.72 × 347.18
  4. Step 4: Simplify right side
    478.12x = 229,041.59
  5. Step 5: Solve for x
    x = 229,041.59/478.12
  6. Step 6: Final answer
    x = 479.05

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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.