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Finding the Fourth Proportional to 647.49, 971.31 and 214.65

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Solution

The fourth proportional to 647.49, 971.31 and 214.65 is: 322.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.49 : 971.31 = 214.65 : x
  2. Step 2: Convert to fraction form
    647.49/971.31 = 214.65/x
  3. Step 3: Cross multiply
    647.49x = 971.31 × 214.65
  4. Step 4: Simplify right side
    647.49x = 208,491.69
  5. Step 5: Solve for x
    x = 208,491.69/647.49
  6. Step 6: Final answer
    x = 322.00

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1.5x scale

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.