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Finding the Fourth Proportional to 848.69, 1,272.32 and 386.31

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Solution

The fourth proportional to 848.69, 1,272.32 and 386.31 is: 579.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.69 : 1,272.32 = 386.31 : x
  2. Step 2: Convert to fraction form
    848.69/1,272.32 = 386.31/x
  3. Step 3: Cross multiply
    848.69x = 1,272.32 × 386.31
  4. Step 4: Simplify right side
    848.69x = 491,509.46
  5. Step 5: Solve for x
    x = 491,509.46/848.69
  6. Step 6: Final answer
    x = 579.14

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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.