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Finding the Fourth Proportional to 425,683.20, 638,435.20 and 215,123.20

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Solution

The fourth proportional to 425,683.20, 638,435.20 and 215,123.20 is: 322,639.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,683.20 : 638,435.20 = 215,123.20 : x
  2. Step 2: Convert to fraction form
    425,683.20/638,435.20 = 215,123.20/x
  3. Step 3: Cross multiply
    425,683.20x = 638,435.20 × 215,123.20
  4. Step 4: Simplify right side
    425,683.20x = 137,342,223,216.64
  5. Step 5: Solve for x
    x = 137,342,223,216.64/425,683.20
  6. Step 6: Final answer
    x = 322,639.52

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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.