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Finding the Fourth Proportional to 989.86, 1,484.86 and 340.58

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Solution

The fourth proportional to 989.86, 1,484.86 and 340.58 is: 510.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.86 : 1,484.86 = 340.58 : x
  2. Step 2: Convert to fraction form
    989.86/1,484.86 = 340.58/x
  3. Step 3: Cross multiply
    989.86x = 1,484.86 × 340.58
  4. Step 4: Simplify right side
    989.86x = 505,713.62
  5. Step 5: Solve for x
    x = 505,713.62/989.86
  6. Step 6: Final answer
    x = 510.89

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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.