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Finding the Fourth Proportional to 1,420.13, 2,130.71 and 495.65

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Solution

The fourth proportional to 1,420.13, 2,130.71 and 495.65 is: 743.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.13 : 2,130.71 = 495.65 : x
  2. Step 2: Convert to fraction form
    1,420.13/2,130.71 = 495.65/x
  3. Step 3: Cross multiply
    1,420.13x = 2,130.71 × 495.65
  4. Step 4: Simplify right side
    1,420.13x = 1,056,089.26
  5. Step 5: Solve for x
    x = 1,056,089.26/1,420.13
  6. Step 6: Final answer
    x = 743.66

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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.