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Finding the Fourth Proportional to 836.19, 1,153.28 and 780.30

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Solution

The fourth proportional to 836.19, 1,153.28 and 780.30 is: 1,076.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.19 : 1,153.28 = 780.30 : x
  2. Step 2: Convert to fraction form
    836.19/1,153.28 = 780.30/x
  3. Step 3: Cross multiply
    836.19x = 1,153.28 × 780.30
  4. Step 4: Simplify right side
    836.19x = 899,904.38
  5. Step 5: Solve for x
    x = 899,904.38/836.19
  6. Step 6: Final answer
    x = 1,076.20

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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.