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Finding the Fourth Proportional to 343,990.40, 515,985.60 and 91,270.40

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Solution

The fourth proportional to 343,990.40, 515,985.60 and 91,270.40 is: 136,905.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,990.40 : 515,985.60 = 91,270.40 : x
  2. Step 2: Convert to fraction form
    343,990.40/515,985.60 = 91,270.40/x
  3. Step 3: Cross multiply
    343,990.40x = 515,985.60 × 91,270.40
  4. Step 4: Simplify right side
    343,990.40x = 47,094,212,106.24
  5. Step 5: Solve for x
    x = 47,094,212,106.24/343,990.40
  6. Step 6: Final answer
    x = 136,905.60

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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.