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Finding the Fourth Proportional to 876.77, 1,210.14 and 729.15

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Solution

The fourth proportional to 876.77, 1,210.14 and 729.15 is: 1,006.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.77 : 1,210.14 = 729.15 : x
  2. Step 2: Convert to fraction form
    876.77/1,210.14 = 729.15/x
  3. Step 3: Cross multiply
    876.77x = 1,210.14 × 729.15
  4. Step 4: Simplify right side
    876.77x = 882,375.85
  5. Step 5: Solve for x
    x = 882,375.85/876.77
  6. Step 6: Final answer
    x = 1,006.39

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1.5x scale

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.