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Finding the Fourth Proportional to 717,877.86, 990,667.20 and 391,190.28

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Solution

The fourth proportional to 717,877.86, 990,667.20 and 391,190.28 is: 539,840.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,877.86 : 990,667.20 = 391,190.28 : x
  2. Step 2: Convert to fraction form
    717,877.86/990,667.20 = 391,190.28/x
  3. Step 3: Cross multiply
    717,877.86x = 990,667.20 × 391,190.28
  4. Step 4: Simplify right side
    717,877.86x = 387,539,379,354.82
  5. Step 5: Solve for x
    x = 387,539,379,354.82/717,877.86
  6. Step 6: Final answer
    x = 539,840.27

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1.5x scale

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.