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Finding the Fourth Proportional to 647.40, 969.18 and 583.40

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Solution

The fourth proportional to 647.40, 969.18 and 583.40 is: 873.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.40 : 969.18 = 583.40 : x
  2. Step 2: Convert to fraction form
    647.40/969.18 = 583.40/x
  3. Step 3: Cross multiply
    647.40x = 969.18 × 583.40
  4. Step 4: Simplify right side
    647.40x = 565,419.61
  5. Step 5: Solve for x
    x = 565,419.61/647.40
  6. Step 6: Final answer
    x = 873.37

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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.