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Finding the Fourth Proportional to 385,606.80, 579,101.40 and 280,544.40

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Solution

The fourth proportional to 385,606.80, 579,101.40 and 280,544.40 is: 421,319.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,606.80 : 579,101.40 = 280,544.40 : x
  2. Step 2: Convert to fraction form
    385,606.80/579,101.40 = 280,544.40/x
  3. Step 3: Cross multiply
    385,606.80x = 579,101.40 × 280,544.40
  4. Step 4: Simplify right side
    385,606.80x = 162,463,654,802.16
  5. Step 5: Solve for x
    x = 162,463,654,802.16/385,606.80
  6. Step 6: Final answer
    x = 421,319.48

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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.