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Finding the Fourth Proportional to 783.95, 1,176.31 and 554.31

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Solution

The fourth proportional to 783.95, 1,176.31 and 554.31 is: 831.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.95 : 1,176.31 = 554.31 : x
  2. Step 2: Convert to fraction form
    783.95/1,176.31 = 554.31/x
  3. Step 3: Cross multiply
    783.95x = 1,176.31 × 554.31
  4. Step 4: Simplify right side
    783.95x = 652,043.42
  5. Step 5: Solve for x
    x = 652,043.42/783.95
  6. Step 6: Final answer
    x = 831.74

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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.