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Finding the Fourth Proportional to 1,430.12, 2,145 and 505.72

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Solution

The fourth proportional to 1,430.12, 2,145 and 505.72 is: 758.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.12 : 2,145 = 505.72 : x
  2. Step 2: Convert to fraction form
    1,430.12/2,145 = 505.72/x
  3. Step 3: Cross multiply
    1,430.12x = 2,145 × 505.72
  4. Step 4: Simplify right side
    1,430.12x = 1,084,769.40
  5. Step 5: Solve for x
    x = 1,084,769.40/1,430.12
  6. Step 6: Final answer
    x = 758.52

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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.