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Finding the Fourth Proportional to 519,944.80, 780,500.40 and 402,138.40

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Solution

The fourth proportional to 519,944.80, 780,500.40 and 402,138.40 is: 603,658.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,944.80 : 780,500.40 = 402,138.40 : x
  2. Step 2: Convert to fraction form
    519,944.80/780,500.40 = 402,138.40/x
  3. Step 3: Cross multiply
    519,944.80x = 780,500.40 × 402,138.40
  4. Step 4: Simplify right side
    519,944.80x = 313,869,182,055.36
  5. Step 5: Solve for x
    x = 313,869,182,055.36/519,944.80
  6. Step 6: Final answer
    x = 603,658.66

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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.