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Finding the Fourth Proportional to 620,405.10, 930,607.65 and 407,828.70

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Solution

The fourth proportional to 620,405.10, 930,607.65 and 407,828.70 is: 611,743.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,405.10 : 930,607.65 = 407,828.70 : x
  2. Step 2: Convert to fraction form
    620,405.10/930,607.65 = 407,828.70/x
  3. Step 3: Cross multiply
    620,405.10x = 930,607.65 × 407,828.70
  4. Step 4: Simplify right side
    620,405.10x = 379,528,508,109.56
  5. Step 5: Solve for x
    x = 379,528,508,109.56/620,405.10
  6. Step 6: Final answer
    x = 611,743.05

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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.