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Finding the Fourth Proportional to 459,940.80, 689,911.20 and 425,726.40

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Solution

The fourth proportional to 459,940.80, 689,911.20 and 425,726.40 is: 638,589.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    459,940.80 : 689,911.20 = 425,726.40 : x
  2. Step 2: Convert to fraction form
    459,940.80/689,911.20 = 425,726.40/x
  3. Step 3: Cross multiply
    459,940.80x = 689,911.20 × 425,726.40
  4. Step 4: Simplify right side
    459,940.80x = 293,713,411,495.68
  5. Step 5: Solve for x
    x = 293,713,411,495.68/459,940.80
  6. Step 6: Final answer
    x = 638,589.60

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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.