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Finding the Fourth Proportional to 1,428.28, 1,971.02 and 838.70

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Solution

The fourth proportional to 1,428.28, 1,971.02 and 838.70 is: 1,157.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.28 : 1,971.02 = 838.70 : x
  2. Step 2: Convert to fraction form
    1,428.28/1,971.02 = 838.70/x
  3. Step 3: Cross multiply
    1,428.28x = 1,971.02 × 838.70
  4. Step 4: Simplify right side
    1,428.28x = 1,653,094.47
  5. Step 5: Solve for x
    x = 1,653,094.47/1,428.28
  6. Step 6: Final answer
    x = 1,157.40

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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.