Home / 1,430.30-2,145.51-390.26

Finding the Fourth Proportional to 1,430.30, 2,145.51 and 390.26

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Solution

The fourth proportional to 1,430.30, 2,145.51 and 390.26 is: 585.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.30 : 2,145.51 = 390.26 : x
  2. Step 2: Convert to fraction form
    1,430.30/2,145.51 = 390.26/x
  3. Step 3: Cross multiply
    1,430.30x = 2,145.51 × 390.26
  4. Step 4: Simplify right side
    1,430.30x = 837,306.73
  5. Step 5: Solve for x
    x = 837,306.73/1,430.30
  6. Step 6: Final answer
    x = 585.41

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1.5x scale

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.