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Finding the Fourth Proportional to 1,387.46, 1,913.90 and 882.38

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Solution

The fourth proportional to 1,387.46, 1,913.90 and 882.38 is: 1,217.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.46 : 1,913.90 = 882.38 : x
  2. Step 2: Convert to fraction form
    1,387.46/1,913.90 = 882.38/x
  3. Step 3: Cross multiply
    1,387.46x = 1,913.90 × 882.38
  4. Step 4: Simplify right side
    1,387.46x = 1,688,787.08
  5. Step 5: Solve for x
    x = 1,688,787.08/1,387.46
  6. Step 6: Final answer
    x = 1,217.18

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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.