Home / 1,416.13-2,124.21-390.13

Finding the Fourth Proportional to 1,416.13, 2,124.21 and 390.13

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Solution

The fourth proportional to 1,416.13, 2,124.21 and 390.13 is: 585.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,416.13 : 2,124.21 = 390.13 : x
  2. Step 2: Convert to fraction form
    1,416.13/2,124.21 = 390.13/x
  3. Step 3: Cross multiply
    1,416.13x = 2,124.21 × 390.13
  4. Step 4: Simplify right side
    1,416.13x = 828,718.05
  5. Step 5: Solve for x
    x = 828,718.05/1,416.13
  6. Step 6: Final answer
    x = 585.20

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Double scale
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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.