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Finding the Fourth Proportional to 2,457.80, 3,390.22 and 2,143.80

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Solution

The fourth proportional to 2,457.80, 3,390.22 and 2,143.80 is: 2,957.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,457.80 : 3,390.22 = 2,143.80 : x
  2. Step 2: Convert to fraction form
    2,457.80/3,390.22 = 2,143.80/x
  3. Step 3: Cross multiply
    2,457.80x = 3,390.22 × 2,143.80
  4. Step 4: Simplify right side
    2,457.80x = 7,267,953.64
  5. Step 5: Solve for x
    x = 7,267,953.64/2,457.80
  6. Step 6: Final answer
    x = 2,957.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.