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Finding the Fourth Proportional to 907.79, 1,362.59 and 648.09

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Solution

The fourth proportional to 907.79, 1,362.59 and 648.09 is: 972.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.79 : 1,362.59 = 648.09 : x
  2. Step 2: Convert to fraction form
    907.79/1,362.59 = 648.09/x
  3. Step 3: Cross multiply
    907.79x = 1,362.59 × 648.09
  4. Step 4: Simplify right side
    907.79x = 883,077.71
  5. Step 5: Solve for x
    x = 883,077.71/907.79
  6. Step 6: Final answer
    x = 972.78

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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.