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Finding the Fourth Proportional to 491.51, 678.30 and 270.47

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Solution

The fourth proportional to 491.51, 678.30 and 270.47 is: 373.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.51 : 678.30 = 270.47 : x
  2. Step 2: Convert to fraction form
    491.51/678.30 = 270.47/x
  3. Step 3: Cross multiply
    491.51x = 678.30 × 270.47
  4. Step 4: Simplify right side
    491.51x = 183,459.80
  5. Step 5: Solve for x
    x = 183,459.80/491.51
  6. Step 6: Final answer
    x = 373.26

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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.