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Finding the Fourth Proportional to 1,307.94, 1,805.05 and 1,228.76

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Solution

The fourth proportional to 1,307.94, 1,805.05 and 1,228.76 is: 1,695.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.94 : 1,805.05 = 1,228.76 : x
  2. Step 2: Convert to fraction form
    1,307.94/1,805.05 = 1,228.76/x
  3. Step 3: Cross multiply
    1,307.94x = 1,805.05 × 1,228.76
  4. Step 4: Simplify right side
    1,307.94x = 2,217,973.24
  5. Step 5: Solve for x
    x = 2,217,973.24/1,307.94
  6. Step 6: Final answer
    x = 1,695.78

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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.