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Finding the Fourth Proportional to 438,015.51, 657,019.35 and 138,496.28

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Solution

The fourth proportional to 438,015.51, 657,019.35 and 138,496.28 is: 207,743.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,015.51 : 657,019.35 = 138,496.28 : x
  2. Step 2: Convert to fraction form
    438,015.51/657,019.35 = 138,496.28/x
  3. Step 3: Cross multiply
    438,015.51x = 657,019.35 × 138,496.28
  4. Step 4: Simplify right side
    438,015.51x = 90,994,732,577.92
  5. Step 5: Solve for x
    x = 90,994,732,577.92/438,015.51
  6. Step 6: Final answer
    x = 207,743.17

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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.