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Finding the Fourth Proportional to 999.58, 1,499.36 and 690.50

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Solution

The fourth proportional to 999.58, 1,499.36 and 690.50 is: 1,035.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.58 : 1,499.36 = 690.50 : x
  2. Step 2: Convert to fraction form
    999.58/1,499.36 = 690.50/x
  3. Step 3: Cross multiply
    999.58x = 1,499.36 × 690.50
  4. Step 4: Simplify right side
    999.58x = 1,035,308.08
  5. Step 5: Solve for x
    x = 1,035,308.08/999.58
  6. Step 6: Final answer
    x = 1,035.74

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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.