Home / 1,430.69-2,145.89-456.80

Finding the Fourth Proportional to 1,430.69, 2,145.89 and 456.80

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Solution

The fourth proportional to 1,430.69, 2,145.89 and 456.80 is: 685.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.69 : 2,145.89 = 456.80 : x
  2. Step 2: Convert to fraction form
    1,430.69/2,145.89 = 456.80/x
  3. Step 3: Cross multiply
    1,430.69x = 2,145.89 × 456.80
  4. Step 4: Simplify right side
    1,430.69x = 980,232.96
  5. Step 5: Solve for x
    x = 980,232.96/1,430.69
  6. Step 6: Final answer
    x = 685.15

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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.