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Finding the Fourth Proportional to 885,999.40, 1,328,999.10 and 620,060.20

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Solution

The fourth proportional to 885,999.40, 1,328,999.10 and 620,060.20 is: 930,090.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    885,999.40 : 1,328,999.10 = 620,060.20 : x
  2. Step 2: Convert to fraction form
    885,999.40/1,328,999.10 = 620,060.20/x
  3. Step 3: Cross multiply
    885,999.40x = 1,328,999.10 × 620,060.20
  4. Step 4: Simplify right side
    885,999.40x = 824,059,447,745.82
  5. Step 5: Solve for x
    x = 824,059,447,745.82/885,999.40
  6. Step 6: Final answer
    x = 930,090.30

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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.