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Finding the Fourth Proportional to 628.09, 866.63 and 407.01

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Solution

The fourth proportional to 628.09, 866.63 and 407.01 is: 561.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.09 : 866.63 = 407.01 : x
  2. Step 2: Convert to fraction form
    628.09/866.63 = 407.01/x
  3. Step 3: Cross multiply
    628.09x = 866.63 × 407.01
  4. Step 4: Simplify right side
    628.09x = 352,722.74
  5. Step 5: Solve for x
    x = 352,722.74/628.09
  6. Step 6: Final answer
    x = 561.58

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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.