Home / 1,539.30-2,124.21-840.66

Finding the Fourth Proportional to 1,539.30, 2,124.21 and 840.66

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Solution

The fourth proportional to 1,539.30, 2,124.21 and 840.66 is: 1,160.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.30 : 2,124.21 = 840.66 : x
  2. Step 2: Convert to fraction form
    1,539.30/2,124.21 = 840.66/x
  3. Step 3: Cross multiply
    1,539.30x = 2,124.21 × 840.66
  4. Step 4: Simplify right side
    1,539.30x = 1,785,738.38
  5. Step 5: Solve for x
    x = 1,785,738.38/1,539.30
  6. Step 6: Final answer
    x = 1,160.10

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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.