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Finding the Fourth Proportional to 785.70, 1,178.55 and 705.51

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Solution

The fourth proportional to 785.70, 1,178.55 and 705.51 is: 1,058.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.70 : 1,178.55 = 705.51 : x
  2. Step 2: Convert to fraction form
    785.70/1,178.55 = 705.51/x
  3. Step 3: Cross multiply
    785.70x = 1,178.55 × 705.51
  4. Step 4: Simplify right side
    785.70x = 831,478.81
  5. Step 5: Solve for x
    x = 831,478.81/785.70
  6. Step 6: Final answer
    x = 1,058.27

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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.