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Finding the Fourth Proportional to 485,705.90, 728,117.80 and 169,990.58

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Solution

The fourth proportional to 485,705.90, 728,117.80 and 169,990.58 is: 254,831.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,705.90 : 728,117.80 = 169,990.58 : x
  2. Step 2: Convert to fraction form
    485,705.90/728,117.80 = 169,990.58/x
  3. Step 3: Cross multiply
    485,705.90x = 728,117.80 × 169,990.58
  4. Step 4: Simplify right side
    485,705.90x = 123,773,167,130.32
  5. Step 5: Solve for x
    x = 123,773,167,130.32/485,705.90
  6. Step 6: Final answer
    x = 254,831.51

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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.