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Finding the Fourth Proportional to 720,999.63, 994,985.96 and 398,731.50

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Solution

The fourth proportional to 720,999.63, 994,985.96 and 398,731.50 is: 550,253.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,999.63 : 994,985.96 = 398,731.50 : x
  2. Step 2: Convert to fraction form
    720,999.63/994,985.96 = 398,731.50/x
  3. Step 3: Cross multiply
    720,999.63x = 994,985.96 × 398,731.50
  4. Step 4: Simplify right side
    720,999.63x = 396,732,242,316.08
  5. Step 5: Solve for x
    x = 396,732,242,316.08/720,999.63
  6. Step 6: Final answer
    x = 550,253.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.