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Finding the Fourth Proportional to 936.45, 1,291.59 and 621.15

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Solution

The fourth proportional to 936.45, 1,291.59 and 621.15 is: 856.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.45 : 1,291.59 = 621.15 : x
  2. Step 2: Convert to fraction form
    936.45/1,291.59 = 621.15/x
  3. Step 3: Cross multiply
    936.45x = 1,291.59 × 621.15
  4. Step 4: Simplify right side
    936.45x = 802,271.13
  5. Step 5: Solve for x
    x = 802,271.13/936.45
  6. Step 6: Final answer
    x = 856.72

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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.