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Finding the Fourth Proportional to 875.72, 1,207.50 and 653.96

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Solution

The fourth proportional to 875.72, 1,207.50 and 653.96 is: 901.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.72 : 1,207.50 = 653.96 : x
  2. Step 2: Convert to fraction form
    875.72/1,207.50 = 653.96/x
  3. Step 3: Cross multiply
    875.72x = 1,207.50 × 653.96
  4. Step 4: Simplify right side
    875.72x = 789,656.70
  5. Step 5: Solve for x
    x = 789,656.70/875.72
  6. Step 6: Final answer
    x = 901.72

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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.