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Finding the Fourth Proportional to 1,478.40, 2,039.88 and 857.40

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Solution

The fourth proportional to 1,478.40, 2,039.88 and 857.40 is: 1,183.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.40 : 2,039.88 = 857.40 : x
  2. Step 2: Convert to fraction form
    1,478.40/2,039.88 = 857.40/x
  3. Step 3: Cross multiply
    1,478.40x = 2,039.88 × 857.40
  4. Step 4: Simplify right side
    1,478.40x = 1,748,993.11
  5. Step 5: Solve for x
    x = 1,748,993.11/1,478.40
  6. Step 6: Final answer
    x = 1,183.03

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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.