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Finding the Fourth Proportional to 1,928.50, 2,890.64 and 990.13

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Solution

The fourth proportional to 1,928.50, 2,890.64 and 990.13 is: 1,484.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,928.50 : 2,890.64 = 990.13 : x
  2. Step 2: Convert to fraction form
    1,928.50/2,890.64 = 990.13/x
  3. Step 3: Cross multiply
    1,928.50x = 2,890.64 × 990.13
  4. Step 4: Simplify right side
    1,928.50x = 2,862,109.38
  5. Step 5: Solve for x
    x = 2,862,109.38/1,928.50
  6. Step 6: Final answer
    x = 1,484.11

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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.