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Finding the Fourth Proportional to 1,307.66, 1,961.48 and 320.47

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Solution

The fourth proportional to 1,307.66, 1,961.48 and 320.47 is: 480.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.66 : 1,961.48 = 320.47 : x
  2. Step 2: Convert to fraction form
    1,307.66/1,961.48 = 320.47/x
  3. Step 3: Cross multiply
    1,307.66x = 1,961.48 × 320.47
  4. Step 4: Simplify right side
    1,307.66x = 628,591.39
  5. Step 5: Solve for x
    x = 628,591.39/1,307.66
  6. Step 6: Final answer
    x = 480.70

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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.