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Finding the Fourth Proportional to 520,913.80, 781,370.70 and 426,435.40

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Solution

The fourth proportional to 520,913.80, 781,370.70 and 426,435.40 is: 639,653.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,913.80 : 781,370.70 = 426,435.40 : x
  2. Step 2: Convert to fraction form
    520,913.80/781,370.70 = 426,435.40/x
  3. Step 3: Cross multiply
    520,913.80x = 781,370.70 × 426,435.40
  4. Step 4: Simplify right side
    520,913.80x = 333,204,127,002.78
  5. Step 5: Solve for x
    x = 333,204,127,002.78/520,913.80
  6. Step 6: Final answer
    x = 639,653.10

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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.