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Finding the Fourth Proportional to 989.84, 1,485.12 and 502.50

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Solution

The fourth proportional to 989.84, 1,485.12 and 502.50 is: 753.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.84 : 1,485.12 = 502.50 : x
  2. Step 2: Convert to fraction form
    989.84/1,485.12 = 502.50/x
  3. Step 3: Cross multiply
    989.84x = 1,485.12 × 502.50
  4. Step 4: Simplify right side
    989.84x = 746,272.80
  5. Step 5: Solve for x
    x = 746,272.80/989.84
  6. Step 6: Final answer
    x = 753.93

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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.