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Finding the Fourth Proportional to 652,640.40, 978,960.60 and 386,263.80

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Solution

The fourth proportional to 652,640.40, 978,960.60 and 386,263.80 is: 579,395.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    652,640.40 : 978,960.60 = 386,263.80 : x
  2. Step 2: Convert to fraction form
    652,640.40/978,960.60 = 386,263.80/x
  3. Step 3: Cross multiply
    652,640.40x = 978,960.60 × 386,263.80
  4. Step 4: Simplify right side
    652,640.40x = 378,137,041,406.28
  5. Step 5: Solve for x
    x = 378,137,041,406.28/652,640.40
  6. Step 6: Final answer
    x = 579,395.70

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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.