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Finding the Fourth Proportional to 989.53, 1,485.18 and 502.93

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Solution

The fourth proportional to 989.53, 1,485.18 and 502.93 is: 754.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.53 : 1,485.18 = 502.93 : x
  2. Step 2: Convert to fraction form
    989.53/1,485.18 = 502.93/x
  3. Step 3: Cross multiply
    989.53x = 1,485.18 × 502.93
  4. Step 4: Simplify right side
    989.53x = 746,941.58
  5. Step 5: Solve for x
    x = 746,941.58/989.53
  6. Step 6: Final answer
    x = 754.84

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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.