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Finding the Fourth Proportional to 900.23, 1,350.15 and 639.50

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Solution

The fourth proportional to 900.23, 1,350.15 and 639.50 is: 959.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.23 : 1,350.15 = 639.50 : x
  2. Step 2: Convert to fraction form
    900.23/1,350.15 = 639.50/x
  3. Step 3: Cross multiply
    900.23x = 1,350.15 × 639.50
  4. Step 4: Simplify right side
    900.23x = 863,414.17
  5. Step 5: Solve for x
    x = 863,414.17/900.23
  6. Step 6: Final answer
    x = 959.11

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1.5x scale

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.