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Finding the Fourth Proportional to 1,913.97, 2,870.85 and 939.75

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Solution

The fourth proportional to 1,913.97, 2,870.85 and 939.75 is: 1,409.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.97 : 2,870.85 = 939.75 : x
  2. Step 2: Convert to fraction form
    1,913.97/2,870.85 = 939.75/x
  3. Step 3: Cross multiply
    1,913.97x = 2,870.85 × 939.75
  4. Step 4: Simplify right side
    1,913.97x = 2,697,881.29
  5. Step 5: Solve for x
    x = 2,697,881.29/1,913.97
  6. Step 6: Final answer
    x = 1,409.57

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1.5x scale

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.