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Finding the Fourth Proportional to 787.48, 1,172.49 and 785.06

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Solution

The fourth proportional to 787.48, 1,172.49 and 785.06 is: 1,168.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.48 : 1,172.49 = 785.06 : x
  2. Step 2: Convert to fraction form
    787.48/1,172.49 = 785.06/x
  3. Step 3: Cross multiply
    787.48x = 1,172.49 × 785.06
  4. Step 4: Simplify right side
    787.48x = 920,475.00
  5. Step 5: Solve for x
    x = 920,475.00/787.48
  6. Step 6: Final answer
    x = 1,168.89

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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.