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Finding the Fourth Proportional to 390,908.56, 539,175.71 and 358,747.03

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Solution

The fourth proportional to 390,908.56, 539,175.71 and 358,747.03 is: 494,815.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,908.56 : 539,175.71 = 358,747.03 : x
  2. Step 2: Convert to fraction form
    390,908.56/539,175.71 = 358,747.03/x
  3. Step 3: Cross multiply
    390,908.56x = 539,175.71 × 358,747.03
  4. Step 4: Simplify right side
    390,908.56x = 193,427,686,434.47
  5. Step 5: Solve for x
    x = 193,427,686,434.47/390,908.56
  6. Step 6: Final answer
    x = 494,815.69

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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.