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Finding the Fourth Proportional to 875.18, 1,208.90 and 653.75

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Solution

The fourth proportional to 875.18, 1,208.90 and 653.75 is: 903.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.18 : 1,208.90 = 653.75 : x
  2. Step 2: Convert to fraction form
    875.18/1,208.90 = 653.75/x
  3. Step 3: Cross multiply
    875.18x = 1,208.90 × 653.75
  4. Step 4: Simplify right side
    875.18x = 790,309.06
  5. Step 5: Solve for x
    x = 790,309.06/875.18
  6. Step 6: Final answer
    x = 903.02

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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.