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Finding the Fourth Proportional to 989.68, 1,484.24 and 340.40

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Solution

The fourth proportional to 989.68, 1,484.24 and 340.40 is: 510.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.68 : 1,484.24 = 340.40 : x
  2. Step 2: Convert to fraction form
    989.68/1,484.24 = 340.40/x
  3. Step 3: Cross multiply
    989.68x = 1,484.24 × 340.40
  4. Step 4: Simplify right side
    989.68x = 505,235.30
  5. Step 5: Solve for x
    x = 505,235.30/989.68
  6. Step 6: Final answer
    x = 510.50

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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.