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Finding the Fourth Proportional to 989.62, 1,484.65 and 340.35

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Solution

The fourth proportional to 989.62, 1,484.65 and 340.35 is: 510.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.62 : 1,484.65 = 340.35 : x
  2. Step 2: Convert to fraction form
    989.62/1,484.65 = 340.35/x
  3. Step 3: Cross multiply
    989.62x = 1,484.65 × 340.35
  4. Step 4: Simplify right side
    989.62x = 505,300.63
  5. Step 5: Solve for x
    x = 505,300.63/989.62
  6. Step 6: Final answer
    x = 510.60

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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.