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Finding the Fourth Proportional to 761.16, 1,140.66 and 606.40

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Solution

The fourth proportional to 761.16, 1,140.66 and 606.40 is: 908.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.16 : 1,140.66 = 606.40 : x
  2. Step 2: Convert to fraction form
    761.16/1,140.66 = 606.40/x
  3. Step 3: Cross multiply
    761.16x = 1,140.66 × 606.40
  4. Step 4: Simplify right side
    761.16x = 691,696.22
  5. Step 5: Solve for x
    x = 691,696.22/761.16
  6. Step 6: Final answer
    x = 908.74

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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.