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Finding the Fourth Proportional to 1,340.71, 1,849.08 and 920.40

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Solution

The fourth proportional to 1,340.71, 1,849.08 and 920.40 is: 1,269.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,340.71 : 1,849.08 = 920.40 : x
  2. Step 2: Convert to fraction form
    1,340.71/1,849.08 = 920.40/x
  3. Step 3: Cross multiply
    1,340.71x = 1,849.08 × 920.40
  4. Step 4: Simplify right side
    1,340.71x = 1,701,892.37
  5. Step 5: Solve for x
    x = 1,701,892.37/1,340.71
  6. Step 6: Final answer
    x = 1,269.39

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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.