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Finding the Fourth Proportional to 783.88, 1,176.40 and 631.65

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Solution

The fourth proportional to 783.88, 1,176.40 and 631.65 is: 947.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.88 : 1,176.40 = 631.65 : x
  2. Step 2: Convert to fraction form
    783.88/1,176.40 = 631.65/x
  3. Step 3: Cross multiply
    783.88x = 1,176.40 × 631.65
  4. Step 4: Simplify right side
    783.88x = 743,073.06
  5. Step 5: Solve for x
    x = 743,073.06/783.88
  6. Step 6: Final answer
    x = 947.94

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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.