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Finding the Fourth Proportional to 875.31, 1,311.33 and 436.03

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Solution

The fourth proportional to 875.31, 1,311.33 and 436.03 is: 653.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.31 : 1,311.33 = 436.03 : x
  2. Step 2: Convert to fraction form
    875.31/1,311.33 = 436.03/x
  3. Step 3: Cross multiply
    875.31x = 1,311.33 × 436.03
  4. Step 4: Simplify right side
    875.31x = 571,779.22
  5. Step 5: Solve for x
    x = 571,779.22/875.31
  6. Step 6: Final answer
    x = 653.23

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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.