Home / 1,539.19-2,123.62-909.77

Finding the Fourth Proportional to 1,539.19, 2,123.62 and 909.77

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Solution

The fourth proportional to 1,539.19, 2,123.62 and 909.77 is: 1,255.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.19 : 2,123.62 = 909.77 : x
  2. Step 2: Convert to fraction form
    1,539.19/2,123.62 = 909.77/x
  3. Step 3: Cross multiply
    1,539.19x = 2,123.62 × 909.77
  4. Step 4: Simplify right side
    1,539.19x = 1,932,005.77
  5. Step 5: Solve for x
    x = 1,932,005.77/1,539.19
  6. Step 6: Final answer
    x = 1,255.21

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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.