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Finding the Fourth Proportional to 515,087.80, 772,631.70 and 438,980.20

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Solution

The fourth proportional to 515,087.80, 772,631.70 and 438,980.20 is: 658,470.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,087.80 : 772,631.70 = 438,980.20 : x
  2. Step 2: Convert to fraction form
    515,087.80/772,631.70 = 438,980.20/x
  3. Step 3: Cross multiply
    515,087.80x = 772,631.70 × 438,980.20
  4. Step 4: Simplify right side
    515,087.80x = 339,170,018,192.34
  5. Step 5: Solve for x
    x = 339,170,018,192.34/515,087.80
  6. Step 6: Final answer
    x = 658,470.30

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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.