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Finding the Fourth Proportional to 1,439.90, 2,160.46 and 856.02

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Solution

The fourth proportional to 1,439.90, 2,160.46 and 856.02 is: 1,284.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.90 : 2,160.46 = 856.02 : x
  2. Step 2: Convert to fraction form
    1,439.90/2,160.46 = 856.02/x
  3. Step 3: Cross multiply
    1,439.90x = 2,160.46 × 856.02
  4. Step 4: Simplify right side
    1,439.90x = 1,849,399.11
  5. Step 5: Solve for x
    x = 1,849,399.11/1,439.90
  6. Step 6: Final answer
    x = 1,284.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.