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Finding the Fourth Proportional to 520,266.80, 780,400.20 and 402,168.80

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Solution

The fourth proportional to 520,266.80, 780,400.20 and 402,168.80 is: 603,253.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,266.80 : 780,400.20 = 402,168.80 : x
  2. Step 2: Convert to fraction form
    520,266.80/780,400.20 = 402,168.80/x
  3. Step 3: Cross multiply
    520,266.80x = 780,400.20 × 402,168.80
  4. Step 4: Simplify right side
    520,266.80x = 313,852,611,953.76
  5. Step 5: Solve for x
    x = 313,852,611,953.76/520,266.80
  6. Step 6: Final answer
    x = 603,253.20

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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.