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Finding the Fourth Proportional to 989.15, 1,483.18 and 623.16

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Solution

The fourth proportional to 989.15, 1,483.18 and 623.16 is: 934.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.15 : 1,483.18 = 623.16 : x
  2. Step 2: Convert to fraction form
    989.15/1,483.18 = 623.16/x
  3. Step 3: Cross multiply
    989.15x = 1,483.18 × 623.16
  4. Step 4: Simplify right side
    989.15x = 924,256.89
  5. Step 5: Solve for x
    x = 924,256.89/989.15
  6. Step 6: Final answer
    x = 934.39

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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.