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Finding the Fourth Proportional to 1,390.68, 2,086.20 and 740.88

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Solution

The fourth proportional to 1,390.68, 2,086.20 and 740.88 is: 1,111.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.68 : 2,086.20 = 740.88 : x
  2. Step 2: Convert to fraction form
    1,390.68/2,086.20 = 740.88/x
  3. Step 3: Cross multiply
    1,390.68x = 2,086.20 × 740.88
  4. Step 4: Simplify right side
    1,390.68x = 1,545,623.86
  5. Step 5: Solve for x
    x = 1,545,623.86/1,390.68
  6. Step 6: Final answer
    x = 1,111.42

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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.