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Finding the Fourth Proportional to 783.40, 1,172.40 and 540.40

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Solution

The fourth proportional to 783.40, 1,172.40 and 540.40 is: 808.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.40 : 1,172.40 = 540.40 : x
  2. Step 2: Convert to fraction form
    783.40/1,172.40 = 540.40/x
  3. Step 3: Cross multiply
    783.40x = 1,172.40 × 540.40
  4. Step 4: Simplify right side
    783.40x = 633,564.96
  5. Step 5: Solve for x
    x = 633,564.96/783.40
  6. Step 6: Final answer
    x = 808.74

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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.