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Finding the Fourth Proportional to 520,218.80, 780,328.20 and 489,114.80

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Solution

The fourth proportional to 520,218.80, 780,328.20 and 489,114.80 is: 733,672.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,218.80 : 780,328.20 = 489,114.80 : x
  2. Step 2: Convert to fraction form
    520,218.80/780,328.20 = 489,114.80/x
  3. Step 3: Cross multiply
    520,218.80x = 780,328.20 × 489,114.80
  4. Step 4: Simplify right side
    520,218.80x = 381,670,071,477.36
  5. Step 5: Solve for x
    x = 381,670,071,477.36/520,218.80
  6. Step 6: Final answer
    x = 733,672.20

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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.