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Finding the Fourth Proportional to 875.51, 1,313.31 and 407.43

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Solution

The fourth proportional to 875.51, 1,313.31 and 407.43 is: 611.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.51 : 1,313.31 = 407.43 : x
  2. Step 2: Convert to fraction form
    875.51/1,313.31 = 407.43/x
  3. Step 3: Cross multiply
    875.51x = 1,313.31 × 407.43
  4. Step 4: Simplify right side
    875.51x = 535,073.29
  5. Step 5: Solve for x
    x = 535,073.29/875.51
  6. Step 6: Final answer
    x = 611.15

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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.