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Finding the Fourth Proportional to 1,430.74, 2,145.72 and 505.80

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Solution

The fourth proportional to 1,430.74, 2,145.72 and 505.80 is: 758.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.74 : 2,145.72 = 505.80 : x
  2. Step 2: Convert to fraction form
    1,430.74/2,145.72 = 505.80/x
  3. Step 3: Cross multiply
    1,430.74x = 2,145.72 × 505.80
  4. Step 4: Simplify right side
    1,430.74x = 1,085,305.18
  5. Step 5: Solve for x
    x = 1,085,305.18/1,430.74
  6. Step 6: Final answer
    x = 758.56

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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.