Home / 1,511.34-2,085.15-921.66

Finding the Fourth Proportional to 1,511.34, 2,085.15 and 921.66

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Solution

The fourth proportional to 1,511.34, 2,085.15 and 921.66 is: 1,271.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.34 : 2,085.15 = 921.66 : x
  2. Step 2: Convert to fraction form
    1,511.34/2,085.15 = 921.66/x
  3. Step 3: Cross multiply
    1,511.34x = 2,085.15 × 921.66
  4. Step 4: Simplify right side
    1,511.34x = 1,921,799.35
  5. Step 5: Solve for x
    x = 1,921,799.35/1,511.34
  6. Step 6: Final answer
    x = 1,271.59

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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.