Home / 1,011.75-1,516.68-921.57

Finding the Fourth Proportional to 1,011.75, 1,516.68 and 921.57

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Solution

The fourth proportional to 1,011.75, 1,516.68 and 921.57 is: 1,381.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.75 : 1,516.68 = 921.57 : x
  2. Step 2: Convert to fraction form
    1,011.75/1,516.68 = 921.57/x
  3. Step 3: Cross multiply
    1,011.75x = 1,516.68 × 921.57
  4. Step 4: Simplify right side
    1,011.75x = 1,397,726.79
  5. Step 5: Solve for x
    x = 1,397,726.79/1,011.75
  6. Step 6: Final answer
    x = 1,381.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.