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Finding the Fourth Proportional to 1,021.87, 1,410.69 and 690.85

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Solution

The fourth proportional to 1,021.87, 1,410.69 and 690.85 is: 953.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.87 : 1,410.69 = 690.85 : x
  2. Step 2: Convert to fraction form
    1,021.87/1,410.69 = 690.85/x
  3. Step 3: Cross multiply
    1,021.87x = 1,410.69 × 690.85
  4. Step 4: Simplify right side
    1,021.87x = 974,575.19
  5. Step 5: Solve for x
    x = 974,575.19/1,021.87
  6. Step 6: Final answer
    x = 953.72

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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.