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Finding the Fourth Proportional to 4,285.80, 6,421.80 and 2,431.40

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Solution

The fourth proportional to 4,285.80, 6,421.80 and 2,431.40 is: 3,643.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,285.80 : 6,421.80 = 2,431.40 : x
  2. Step 2: Convert to fraction form
    4,285.80/6,421.80 = 2,431.40/x
  3. Step 3: Cross multiply
    4,285.80x = 6,421.80 × 2,431.40
  4. Step 4: Simplify right side
    4,285.80x = 15,613,964.52
  5. Step 5: Solve for x
    x = 15,613,964.52/4,285.80
  6. Step 6: Final answer
    x = 3,643.19

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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.