Home / 1,430.23-2,145.13-390.32

Finding the Fourth Proportional to 1,430.23, 2,145.13 and 390.32

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Solution

The fourth proportional to 1,430.23, 2,145.13 and 390.32 is: 585.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.23 : 2,145.13 = 390.32 : x
  2. Step 2: Convert to fraction form
    1,430.23/2,145.13 = 390.32/x
  3. Step 3: Cross multiply
    1,430.23x = 2,145.13 × 390.32
  4. Step 4: Simplify right side
    1,430.23x = 837,287.14
  5. Step 5: Solve for x
    x = 837,287.14/1,430.23
  6. Step 6: Final answer
    x = 585.42

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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.