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Finding the Fourth Proportional to 1,426.34, 2,139.48 and 603.45

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Solution

The fourth proportional to 1,426.34, 2,139.48 and 603.45 is: 905.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.34 : 2,139.48 = 603.45 : x
  2. Step 2: Convert to fraction form
    1,426.34/2,139.48 = 603.45/x
  3. Step 3: Cross multiply
    1,426.34x = 2,139.48 × 603.45
  4. Step 4: Simplify right side
    1,426.34x = 1,291,069.21
  5. Step 5: Solve for x
    x = 1,291,069.21/1,426.34
  6. Step 6: Final answer
    x = 905.16

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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.