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Finding the Fourth Proportional to 425,907.80, 638,723.40 and 141,521.98

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Solution

The fourth proportional to 425,907.80, 638,723.40 and 141,521.98 is: 212,237.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,907.80 : 638,723.40 = 141,521.98 : x
  2. Step 2: Convert to fraction form
    425,907.80/638,723.40 = 141,521.98/x
  3. Step 3: Cross multiply
    425,907.80x = 638,723.40 × 141,521.98
  4. Step 4: Simplify right side
    425,907.80x = 90,393,398,643.52
  5. Step 5: Solve for x
    x = 90,393,398,643.52/425,907.80
  6. Step 6: Final answer
    x = 212,237.01

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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.