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Finding the Fourth Proportional to 489,991.80, 734,987.70 and 209,537.40

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Solution

The fourth proportional to 489,991.80, 734,987.70 and 209,537.40 is: 314,306.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,991.80 : 734,987.70 = 209,537.40 : x
  2. Step 2: Convert to fraction form
    489,991.80/734,987.70 = 209,537.40/x
  3. Step 3: Cross multiply
    489,991.80x = 734,987.70 × 209,537.40
  4. Step 4: Simplify right side
    489,991.80x = 154,007,411,689.98
  5. Step 5: Solve for x
    x = 154,007,411,689.98/489,991.80
  6. Step 6: Final answer
    x = 314,306.10

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Similar ratio
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1.5x scale

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.