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Finding the Fourth Proportional to 268,569.80, 402,368.70 and 128,018.60

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Solution

The fourth proportional to 268,569.80, 402,368.70 and 128,018.60 is: 191,796.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,569.80 : 402,368.70 = 128,018.60 : x
  2. Step 2: Convert to fraction form
    268,569.80/402,368.70 = 128,018.60/x
  3. Step 3: Cross multiply
    268,569.80x = 402,368.70 × 128,018.60
  4. Step 4: Simplify right side
    268,569.80x = 51,510,677,657.82
  5. Step 5: Solve for x
    x = 51,510,677,657.82/268,569.80
  6. Step 6: Final answer
    x = 191,796.24

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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.