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Finding the Fourth Proportional to 489,718.20, 734,577.30 and 405,737.40

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Solution

The fourth proportional to 489,718.20, 734,577.30 and 405,737.40 is: 608,606.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,718.20 : 734,577.30 = 405,737.40 : x
  2. Step 2: Convert to fraction form
    489,718.20/734,577.30 = 405,737.40/x
  3. Step 3: Cross multiply
    489,718.20x = 734,577.30 × 405,737.40
  4. Step 4: Simplify right side
    489,718.20x = 298,045,483,801.02
  5. Step 5: Solve for x
    x = 298,045,483,801.02/489,718.20
  6. Step 6: Final answer
    x = 608,606.10

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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.