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Finding the Fourth Proportional to 611,928.90, 918,221.40 and 256,978.80

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Solution

The fourth proportional to 611,928.90, 918,221.40 and 256,978.80 is: 385,605.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,928.90 : 918,221.40 = 256,978.80 : x
  2. Step 2: Convert to fraction form
    611,928.90/918,221.40 = 256,978.80/x
  3. Step 3: Cross multiply
    611,928.90x = 918,221.40 × 256,978.80
  4. Step 4: Simplify right side
    611,928.90x = 235,963,433,506.32
  5. Step 5: Solve for x
    x = 235,963,433,506.32/611,928.90
  6. Step 6: Final answer
    x = 385,605.96

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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.