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Finding the Fourth Proportional to 158,419.63, 218,813.31 and 128,239.03

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Solution

The fourth proportional to 158,419.63, 218,813.31 and 128,239.03 is: 177,127.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,419.63 : 218,813.31 = 128,239.03 : x
  2. Step 2: Convert to fraction form
    158,419.63/218,813.31 = 128,239.03/x
  3. Step 3: Cross multiply
    158,419.63x = 218,813.31 × 128,239.03
  4. Step 4: Simplify right side
    158,419.63x = 28,060,406,625.49
  5. Step 5: Solve for x
    x = 28,060,406,625.49/158,419.63
  6. Step 6: Final answer
    x = 177,127.08

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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.