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Finding the Fourth Proportional to 907.91, 1,360.80 and 561.33

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Solution

The fourth proportional to 907.91, 1,360.80 and 561.33 is: 841.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.91 : 1,360.80 = 561.33 : x
  2. Step 2: Convert to fraction form
    907.91/1,360.80 = 561.33/x
  3. Step 3: Cross multiply
    907.91x = 1,360.80 × 561.33
  4. Step 4: Simplify right side
    907.91x = 763,857.86
  5. Step 5: Solve for x
    x = 763,857.86/907.91
  6. Step 6: Final answer
    x = 841.34

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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.