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Finding the Fourth Proportional to 679,770.72, 938,280.78 and 421,726.32

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Solution

The fourth proportional to 679,770.72, 938,280.78 and 421,726.32 is: 582,104.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,770.72 : 938,280.78 = 421,726.32 : x
  2. Step 2: Convert to fraction form
    679,770.72/938,280.78 = 421,726.32/x
  3. Step 3: Cross multiply
    679,770.72x = 938,280.78 × 421,726.32
  4. Step 4: Simplify right side
    679,770.72x = 395,697,700,476.13
  5. Step 5: Solve for x
    x = 395,697,700,476.13/679,770.72
  6. Step 6: Final answer
    x = 582,104.66

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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.