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Finding the Fourth Proportional to 425,678.36, 638,583.15 and 145,130

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Solution

The fourth proportional to 425,678.36, 638,583.15 and 145,130 is: 217,717.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,678.36 : 638,583.15 = 145,130 : x
  2. Step 2: Convert to fraction form
    425,678.36/638,583.15 = 145,130/x
  3. Step 3: Cross multiply
    425,678.36x = 638,583.15 × 145,130
  4. Step 4: Simplify right side
    425,678.36x = 92,677,572,559.50
  5. Step 5: Solve for x
    x = 92,677,572,559.50/425,678.36
  6. Step 6: Final answer
    x = 217,717.37

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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.