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Finding the Fourth Proportional to 425,710.80, 638,566.20 and 399,466.80

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Solution

The fourth proportional to 425,710.80, 638,566.20 and 399,466.80 is: 599,200.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,710.80 : 638,566.20 = 399,466.80 : x
  2. Step 2: Convert to fraction form
    425,710.80/638,566.20 = 399,466.80/x
  3. Step 3: Cross multiply
    425,710.80x = 638,566.20 × 399,466.80
  4. Step 4: Simplify right side
    425,710.80x = 255,085,996,502.16
  5. Step 5: Solve for x
    x = 255,085,996,502.16/425,710.80
  6. Step 6: Final answer
    x = 599,200.20

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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.