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Finding the Fourth Proportional to 930.98, 1,284.82 and 615.70

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Solution

The fourth proportional to 930.98, 1,284.82 and 615.70 is: 849.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.98 : 1,284.82 = 615.70 : x
  2. Step 2: Convert to fraction form
    930.98/1,284.82 = 615.70/x
  3. Step 3: Cross multiply
    930.98x = 1,284.82 × 615.70
  4. Step 4: Simplify right side
    930.98x = 791,058.92
  5. Step 5: Solve for x
    x = 791,058.92/930.98
  6. Step 6: Final answer
    x = 849.70

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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.