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Finding the Fourth Proportional to 933.92, 1,289.46 and 639.08

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Solution

The fourth proportional to 933.92, 1,289.46 and 639.08 is: 882.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.92 : 1,289.46 = 639.08 : x
  2. Step 2: Convert to fraction form
    933.92/1,289.46 = 639.08/x
  3. Step 3: Cross multiply
    933.92x = 1,289.46 × 639.08
  4. Step 4: Simplify right side
    933.92x = 824,068.10
  5. Step 5: Solve for x
    x = 824,068.10/933.92
  6. Step 6: Final answer
    x = 882.38

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1.5x scale

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.