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Finding the Fourth Proportional to 839.58, 1,158.78 and 536.55

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Solution

The fourth proportional to 839.58, 1,158.78 and 536.55 is: 740.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.58 : 1,158.78 = 536.55 : x
  2. Step 2: Convert to fraction form
    839.58/1,158.78 = 536.55/x
  3. Step 3: Cross multiply
    839.58x = 1,158.78 × 536.55
  4. Step 4: Simplify right side
    839.58x = 621,746.31
  5. Step 5: Solve for x
    x = 621,746.31/839.58
  6. Step 6: Final answer
    x = 740.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.