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Finding the Fourth Proportional to 1,275.10, 1,912.65 and 837.70

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Solution

The fourth proportional to 1,275.10, 1,912.65 and 837.70 is: 1,256.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.10 : 1,912.65 = 837.70 : x
  2. Step 2: Convert to fraction form
    1,275.10/1,912.65 = 837.70/x
  3. Step 3: Cross multiply
    1,275.10x = 1,912.65 × 837.70
  4. Step 4: Simplify right side
    1,275.10x = 1,602,226.91
  5. Step 5: Solve for x
    x = 1,602,226.91/1,275.10
  6. Step 6: Final answer
    x = 1,256.55

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.