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Finding the Fourth Proportional to 688.99, 1,027.84 and 670.16

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Solution

The fourth proportional to 688.99, 1,027.84 and 670.16 is: 999.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.99 : 1,027.84 = 670.16 : x
  2. Step 2: Convert to fraction form
    688.99/1,027.84 = 670.16/x
  3. Step 3: Cross multiply
    688.99x = 1,027.84 × 670.16
  4. Step 4: Simplify right side
    688.99x = 688,812.12
  5. Step 5: Solve for x
    x = 688,812.12/688.99
  6. Step 6: Final answer
    x = 999.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.