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Finding the Fourth Proportional to 647.51, 971.27 and 257.34

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Solution

The fourth proportional to 647.51, 971.27 and 257.34 is: 386.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.51 : 971.27 = 257.34 : x
  2. Step 2: Convert to fraction form
    647.51/971.27 = 257.34/x
  3. Step 3: Cross multiply
    647.51x = 971.27 × 257.34
  4. Step 4: Simplify right side
    647.51x = 249,945.34
  5. Step 5: Solve for x
    x = 249,945.34/647.51
  6. Step 6: Final answer
    x = 386.01

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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.