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Finding the Fourth Proportional to 487,999.40, 731,999.10 and 320,577.80

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Solution

The fourth proportional to 487,999.40, 731,999.10 and 320,577.80 is: 480,866.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,999.40 : 731,999.10 = 320,577.80 : x
  2. Step 2: Convert to fraction form
    487,999.40/731,999.10 = 320,577.80/x
  3. Step 3: Cross multiply
    487,999.40x = 731,999.10 × 320,577.80
  4. Step 4: Simplify right side
    487,999.40x = 234,662,661,079.98
  5. Step 5: Solve for x
    x = 234,662,661,079.98/487,999.40
  6. Step 6: Final answer
    x = 480,866.70

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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.