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Finding the Fourth Proportional to 933.18, 1,288.23 and 639.99

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Solution

The fourth proportional to 933.18, 1,288.23 and 639.99 is: 883.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.18 : 1,288.23 = 639.99 : x
  2. Step 2: Convert to fraction form
    933.18/1,288.23 = 639.99/x
  3. Step 3: Cross multiply
    933.18x = 1,288.23 × 639.99
  4. Step 4: Simplify right side
    933.18x = 824,454.32
  5. Step 5: Solve for x
    x = 824,454.32/933.18
  6. Step 6: Final answer
    x = 883.49

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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.