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Finding the Fourth Proportional to 608,640.80, 912,961.20 and 440,679.20

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Solution

The fourth proportional to 608,640.80, 912,961.20 and 440,679.20 is: 661,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    608,640.80 : 912,961.20 = 440,679.20 : x
  2. Step 2: Convert to fraction form
    608,640.80/912,961.20 = 440,679.20/x
  3. Step 3: Cross multiply
    608,640.80x = 912,961.20 × 440,679.20
  4. Step 4: Simplify right side
    608,640.80x = 402,323,011,247.04
  5. Step 5: Solve for x
    x = 402,323,011,247.04/608,640.80
  6. Step 6: Final answer
    x = 661,018.80

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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.