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Finding the Fourth Proportional to 1,251.34, 1,875.20 and 919.67

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Solution

The fourth proportional to 1,251.34, 1,875.20 and 919.67 is: 1,378.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.34 : 1,875.20 = 919.67 : x
  2. Step 2: Convert to fraction form
    1,251.34/1,875.20 = 919.67/x
  3. Step 3: Cross multiply
    1,251.34x = 1,875.20 × 919.67
  4. Step 4: Simplify right side
    1,251.34x = 1,724,565.18
  5. Step 5: Solve for x
    x = 1,724,565.18/1,251.34
  6. Step 6: Final answer
    x = 1,378.17

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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.