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Finding the Fourth Proportional to 836.79, 1,154.30 and 615.75

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Solution

The fourth proportional to 836.79, 1,154.30 and 615.75 is: 849.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.79 : 1,154.30 = 615.75 : x
  2. Step 2: Convert to fraction form
    836.79/1,154.30 = 615.75/x
  3. Step 3: Cross multiply
    836.79x = 1,154.30 × 615.75
  4. Step 4: Simplify right side
    836.79x = 710,757.15
  5. Step 5: Solve for x
    x = 710,757.15/836.79
  6. Step 6: Final answer
    x = 849.39

Related Problems

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Half scale
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Double scale
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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.