Home / 1,511.03-2,085.21-921.57

Finding the Fourth Proportional to 1,511.03, 2,085.21 and 921.57

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Solution

The fourth proportional to 1,511.03, 2,085.21 and 921.57 is: 1,271.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.03 : 2,085.21 = 921.57 : x
  2. Step 2: Convert to fraction form
    1,511.03/2,085.21 = 921.57/x
  3. Step 3: Cross multiply
    1,511.03x = 2,085.21 × 921.57
  4. Step 4: Simplify right side
    1,511.03x = 1,921,666.98
  5. Step 5: Solve for x
    x = 1,921,666.98/1,511.03
  6. Step 6: Final answer
    x = 1,271.76

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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.