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Finding the Fourth Proportional to 688.12, 1,031.80 and 456.84

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Solution

The fourth proportional to 688.12, 1,031.80 and 456.84 is: 685.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.12 : 1,031.80 = 456.84 : x
  2. Step 2: Convert to fraction form
    688.12/1,031.80 = 456.84/x
  3. Step 3: Cross multiply
    688.12x = 1,031.80 × 456.84
  4. Step 4: Simplify right side
    688.12x = 471,367.51
  5. Step 5: Solve for x
    x = 471,367.51/688.12
  6. Step 6: Final answer
    x = 685.01

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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.