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Finding the Fourth Proportional to 772.48, 1,153.88 and 554.32

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Solution

The fourth proportional to 772.48, 1,153.88 and 554.32 is: 828.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.48 : 1,153.88 = 554.32 : x
  2. Step 2: Convert to fraction form
    772.48/1,153.88 = 554.32/x
  3. Step 3: Cross multiply
    772.48x = 1,153.88 × 554.32
  4. Step 4: Simplify right side
    772.48x = 639,618.76
  5. Step 5: Solve for x
    x = 639,618.76/772.48
  6. Step 6: Final answer
    x = 828.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.