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Finding the Fourth Proportional to 279,356.80, 385,521.16 and 158,503.20

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Solution

The fourth proportional to 279,356.80, 385,521.16 and 158,503.20 is: 218,739.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,356.80 : 385,521.16 = 158,503.20 : x
  2. Step 2: Convert to fraction form
    279,356.80/385,521.16 = 158,503.20/x
  3. Step 3: Cross multiply
    279,356.80x = 385,521.16 × 158,503.20
  4. Step 4: Simplify right side
    279,356.80x = 61,106,337,527.71
  5. Step 5: Solve for x
    x = 61,106,337,527.71/279,356.80
  6. Step 6: Final answer
    x = 218,739.40

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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.