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Finding the Fourth Proportional to 877.45, 1,207.16 and 853.15

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Solution

The fourth proportional to 877.45, 1,207.16 and 853.15 is: 1,173.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.45 : 1,207.16 = 853.15 : x
  2. Step 2: Convert to fraction form
    877.45/1,207.16 = 853.15/x
  3. Step 3: Cross multiply
    877.45x = 1,207.16 × 853.15
  4. Step 4: Simplify right side
    877.45x = 1,029,884.29
  5. Step 5: Solve for x
    x = 1,029,884.29/877.45
  6. Step 6: Final answer
    x = 1,173.72

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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.