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Finding the Fourth Proportional to 7,530.80, 10,392.40 and 4,218.80

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Solution

The fourth proportional to 7,530.80, 10,392.40 and 4,218.80 is: 5,821.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,530.80 : 10,392.40 = 4,218.80 : x
  2. Step 2: Convert to fraction form
    7,530.80/10,392.40 = 4,218.80/x
  3. Step 3: Cross multiply
    7,530.80x = 10,392.40 × 4,218.80
  4. Step 4: Simplify right side
    7,530.80x = 43,843,457.12
  5. Step 5: Solve for x
    x = 43,843,457.12/7,530.80
  6. Step 6: Final answer
    x = 5,821.89

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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.