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Finding the Fourth Proportional to 1,320.99, 1,981.49 and 347.07

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Solution

The fourth proportional to 1,320.99, 1,981.49 and 347.07 is: 520.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.99 : 1,981.49 = 347.07 : x
  2. Step 2: Convert to fraction form
    1,320.99/1,981.49 = 347.07/x
  3. Step 3: Cross multiply
    1,320.99x = 1,981.49 × 347.07
  4. Step 4: Simplify right side
    1,320.99x = 687,715.73
  5. Step 5: Solve for x
    x = 687,715.73/1,320.99
  6. Step 6: Final answer
    x = 520.61

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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.