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Finding the Fourth Proportional to 1,086.60, 1,499.64 and 713.89

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Solution

The fourth proportional to 1,086.60, 1,499.64 and 713.89 is: 985.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.60 : 1,499.64 = 713.89 : x
  2. Step 2: Convert to fraction form
    1,086.60/1,499.64 = 713.89/x
  3. Step 3: Cross multiply
    1,086.60x = 1,499.64 × 713.89
  4. Step 4: Simplify right side
    1,086.60x = 1,070,570.50
  5. Step 5: Solve for x
    x = 1,070,570.50/1,086.60
  6. Step 6: Final answer
    x = 985.25

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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.