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Finding the Fourth Proportional to 707.99, 1,060.45 and 399.68

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Solution

The fourth proportional to 707.99, 1,060.45 and 399.68 is: 598.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.99 : 1,060.45 = 399.68 : x
  2. Step 2: Convert to fraction form
    707.99/1,060.45 = 399.68/x
  3. Step 3: Cross multiply
    707.99x = 1,060.45 × 399.68
  4. Step 4: Simplify right side
    707.99x = 423,840.66
  5. Step 5: Solve for x
    x = 423,840.66/707.99
  6. Step 6: Final answer
    x = 598.65

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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.