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Finding the Fourth Proportional to 1,235.76, 1,705.52 and 769.76

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Solution

The fourth proportional to 1,235.76, 1,705.52 and 769.76 is: 1,062.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.76 : 1,705.52 = 769.76 : x
  2. Step 2: Convert to fraction form
    1,235.76/1,705.52 = 769.76/x
  3. Step 3: Cross multiply
    1,235.76x = 1,705.52 × 769.76
  4. Step 4: Simplify right side
    1,235.76x = 1,312,841.08
  5. Step 5: Solve for x
    x = 1,312,841.08/1,235.76
  6. Step 6: Final answer
    x = 1,062.38

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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.