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Finding the Fourth Proportional to 1,034.96, 1,428.93 and 685.85

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Solution

The fourth proportional to 1,034.96, 1,428.93 and 685.85 is: 946.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,034.96 : 1,428.93 = 685.85 : x
  2. Step 2: Convert to fraction form
    1,034.96/1,428.93 = 685.85/x
  3. Step 3: Cross multiply
    1,034.96x = 1,428.93 × 685.85
  4. Step 4: Simplify right side
    1,034.96x = 980,024.50
  5. Step 5: Solve for x
    x = 980,024.50/1,034.96
  6. Step 6: Final answer
    x = 946.92

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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.