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Finding the Fourth Proportional to 978,756.80, 1,468,135.20 and 646,332.80

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Solution

The fourth proportional to 978,756.80, 1,468,135.20 and 646,332.80 is: 969,499.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,756.80 : 1,468,135.20 = 646,332.80 : x
  2. Step 2: Convert to fraction form
    978,756.80/1,468,135.20 = 646,332.80/x
  3. Step 3: Cross multiply
    978,756.80x = 1,468,135.20 × 646,332.80
  4. Step 4: Simplify right side
    978,756.80x = 948,903,934,594.56
  5. Step 5: Solve for x
    x = 948,903,934,594.56/978,756.80
  6. Step 6: Final answer
    x = 969,499.20

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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.