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Finding the Fourth Proportional to 1,390.96, 2,086.80 and 525.34

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Solution

The fourth proportional to 1,390.96, 2,086.80 and 525.34 is: 788.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.96 : 2,086.80 = 525.34 : x
  2. Step 2: Convert to fraction form
    1,390.96/2,086.80 = 525.34/x
  3. Step 3: Cross multiply
    1,390.96x = 2,086.80 × 525.34
  4. Step 4: Simplify right side
    1,390.96x = 1,096,279.51
  5. Step 5: Solve for x
    x = 1,096,279.51/1,390.96
  6. Step 6: Final answer
    x = 788.15

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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.