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Finding the Fourth Proportional to 279,398.40, 385,643.90 and 172,058.36

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Solution

The fourth proportional to 279,398.40, 385,643.90 and 172,058.36 is: 237,486.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,398.40 : 385,643.90 = 172,058.36 : x
  2. Step 2: Convert to fraction form
    279,398.40/385,643.90 = 172,058.36/x
  3. Step 3: Cross multiply
    279,398.40x = 385,643.90 × 172,058.36
  4. Step 4: Simplify right side
    279,398.40x = 66,353,256,978.00
  5. Step 5: Solve for x
    x = 66,353,256,978.00/279,398.40
  6. Step 6: Final answer
    x = 237,486.17

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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.