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Finding the Fourth Proportional to 1,390.65, 1,922.39 and 1,113.63

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Solution

The fourth proportional to 1,390.65, 1,922.39 and 1,113.63 is: 1,539.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.65 : 1,922.39 = 1,113.63 : x
  2. Step 2: Convert to fraction form
    1,390.65/1,922.39 = 1,113.63/x
  3. Step 3: Cross multiply
    1,390.65x = 1,922.39 × 1,113.63
  4. Step 4: Simplify right side
    1,390.65x = 2,140,825.61
  5. Step 5: Solve for x
    x = 2,140,825.61/1,390.65
  6. Step 6: Final answer
    x = 1,539.44

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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.