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Finding the Fourth Proportional to 772.90, 1,159.35 and 554.20

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Solution

The fourth proportional to 772.90, 1,159.35 and 554.20 is: 831.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.90 : 1,159.35 = 554.20 : x
  2. Step 2: Convert to fraction form
    772.90/1,159.35 = 554.20/x
  3. Step 3: Cross multiply
    772.90x = 1,159.35 × 554.20
  4. Step 4: Simplify right side
    772.90x = 642,511.77
  5. Step 5: Solve for x
    x = 642,511.77/772.90
  6. Step 6: Final answer
    x = 831.30

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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.