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Finding the Fourth Proportional to 519,620.40, 779,430.60 and 319,291.20

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Solution

The fourth proportional to 519,620.40, 779,430.60 and 319,291.20 is: 478,936.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,620.40 : 779,430.60 = 319,291.20 : x
  2. Step 2: Convert to fraction form
    519,620.40/779,430.60 = 319,291.20/x
  3. Step 3: Cross multiply
    519,620.40x = 779,430.60 × 319,291.20
  4. Step 4: Simplify right side
    519,620.40x = 248,865,331,590.72
  5. Step 5: Solve for x
    x = 248,865,331,590.72/519,620.40
  6. Step 6: Final answer
    x = 478,936.80

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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.