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Finding the Fourth Proportional to 1,086.40, 1,498.87 and 693.65

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Solution

The fourth proportional to 1,086.40, 1,498.87 and 693.65 is: 957.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.40 : 1,498.87 = 693.65 : x
  2. Step 2: Convert to fraction form
    1,086.40/1,498.87 = 693.65/x
  3. Step 3: Cross multiply
    1,086.40x = 1,498.87 × 693.65
  4. Step 4: Simplify right side
    1,086.40x = 1,039,687.71
  5. Step 5: Solve for x
    x = 1,039,687.71/1,086.40
  6. Step 6: Final answer
    x = 957.00

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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.