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Finding the Fourth Proportional to 756.30, 1,043.78 and 457.64

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Solution

The fourth proportional to 756.30, 1,043.78 and 457.64 is: 631.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.30 : 1,043.78 = 457.64 : x
  2. Step 2: Convert to fraction form
    756.30/1,043.78 = 457.64/x
  3. Step 3: Cross multiply
    756.30x = 1,043.78 × 457.64
  4. Step 4: Simplify right side
    756.30x = 477,675.48
  5. Step 5: Solve for x
    x = 477,675.48/756.30
  6. Step 6: Final answer
    x = 631.60

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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.