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Finding the Fourth Proportional to 989.16, 1,365.32 and 616.08

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Solution

The fourth proportional to 989.16, 1,365.32 and 616.08 is: 850.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.16 : 1,365.32 = 616.08 : x
  2. Step 2: Convert to fraction form
    989.16/1,365.32 = 616.08/x
  3. Step 3: Cross multiply
    989.16x = 1,365.32 × 616.08
  4. Step 4: Simplify right side
    989.16x = 841,146.35
  5. Step 5: Solve for x
    x = 841,146.35/989.16
  6. Step 6: Final answer
    x = 850.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.