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Finding the Fourth Proportional to 692,913, 956,220 and 391,126.44

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Solution

The fourth proportional to 692,913, 956,220 and 391,126.44 is: 539,754.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    692,913 : 956,220 = 391,126.44 : x
  2. Step 2: Convert to fraction form
    692,913/956,220 = 391,126.44/x
  3. Step 3: Cross multiply
    692,913x = 956,220 × 391,126.44
  4. Step 4: Simplify right side
    692,913x = 374,002,924,456.80
  5. Step 5: Solve for x
    x = 374,002,924,456.80/692,913
  6. Step 6: Final answer
    x = 539,754.52

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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.