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Finding the Fourth Proportional to 1,632.40, 2,445.90 and 1,389.40

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Solution

The fourth proportional to 1,632.40, 2,445.90 and 1,389.40 is: 2,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,632.40 : 2,445.90 = 1,389.40 : x
  2. Step 2: Convert to fraction form
    1,632.40/2,445.90 = 1,389.40/x
  3. Step 3: Cross multiply
    1,632.40x = 2,445.90 × 1,389.40
  4. Step 4: Simplify right side
    1,632.40x = 3,398,333.46
  5. Step 5: Solve for x
    x = 3,398,333.46/1,632.40
  6. Step 6: Final answer
    x = 2,081.80

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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.