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Finding the Fourth Proportional to 478.10, 715.99 and 272.05

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Solution

The fourth proportional to 478.10, 715.99 and 272.05 is: 407.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.10 : 715.99 = 272.05 : x
  2. Step 2: Convert to fraction form
    478.10/715.99 = 272.05/x
  3. Step 3: Cross multiply
    478.10x = 715.99 × 272.05
  4. Step 4: Simplify right side
    478.10x = 194,783.26
  5. Step 5: Solve for x
    x = 194,783.26/478.10
  6. Step 6: Final answer
    x = 407.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.