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Finding the Fourth Proportional to 684.42, 1,031.35 and 619.44

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Solution

The fourth proportional to 684.42, 1,031.35 and 619.44 is: 933.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.42 : 1,031.35 = 619.44 : x
  2. Step 2: Convert to fraction form
    684.42/1,031.35 = 619.44/x
  3. Step 3: Cross multiply
    684.42x = 1,031.35 × 619.44
  4. Step 4: Simplify right side
    684.42x = 638,859.44
  5. Step 5: Solve for x
    x = 638,859.44/684.42
  6. Step 6: Final answer
    x = 933.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.