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Finding the Fourth Proportional to 1,313.96, 1,812.30 and 1,139

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Solution

The fourth proportional to 1,313.96, 1,812.30 and 1,139 is: 1,570.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.96 : 1,812.30 = 1,139 : x
  2. Step 2: Convert to fraction form
    1,313.96/1,812.30 = 1,139/x
  3. Step 3: Cross multiply
    1,313.96x = 1,812.30 × 1,139
  4. Step 4: Simplify right side
    1,313.96x = 2,064,209.70
  5. Step 5: Solve for x
    x = 2,064,209.70/1,313.96
  6. Step 6: Final answer
    x = 1,570.98

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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.