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Finding the Fourth Proportional to 1,307.39, 1,959.66 and 613.62

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Solution

The fourth proportional to 1,307.39, 1,959.66 and 613.62 is: 919.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.39 : 1,959.66 = 613.62 : x
  2. Step 2: Convert to fraction form
    1,307.39/1,959.66 = 613.62/x
  3. Step 3: Cross multiply
    1,307.39x = 1,959.66 × 613.62
  4. Step 4: Simplify right side
    1,307.39x = 1,202,486.57
  5. Step 5: Solve for x
    x = 1,202,486.57/1,307.39
  6. Step 6: Final answer
    x = 919.76

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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.