Home / 1,539.14-2,123.93-840.51

Finding the Fourth Proportional to 1,539.14, 2,123.93 and 840.51

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Solution

The fourth proportional to 1,539.14, 2,123.93 and 840.51 is: 1,159.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.14 : 2,123.93 = 840.51 : x
  2. Step 2: Convert to fraction form
    1,539.14/2,123.93 = 840.51/x
  3. Step 3: Cross multiply
    1,539.14x = 2,123.93 × 840.51
  4. Step 4: Simplify right side
    1,539.14x = 1,785,180.20
  5. Step 5: Solve for x
    x = 1,785,180.20/1,539.14
  6. Step 6: Final answer
    x = 1,159.86

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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.