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Finding the Fourth Proportional to 923.86, 1,386.70 and 437.25

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Solution

The fourth proportional to 923.86, 1,386.70 and 437.25 is: 656.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.86 : 1,386.70 = 437.25 : x
  2. Step 2: Convert to fraction form
    923.86/1,386.70 = 437.25/x
  3. Step 3: Cross multiply
    923.86x = 1,386.70 × 437.25
  4. Step 4: Simplify right side
    923.86x = 606,333.48
  5. Step 5: Solve for x
    x = 606,333.48/923.86
  6. Step 6: Final answer
    x = 656.31

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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.