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Finding the Fourth Proportional to 838.19, 1,155.40 and 713.81

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Solution

The fourth proportional to 838.19, 1,155.40 and 713.81 is: 983.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.19 : 1,155.40 = 713.81 : x
  2. Step 2: Convert to fraction form
    838.19/1,155.40 = 713.81/x
  3. Step 3: Cross multiply
    838.19x = 1,155.40 × 713.81
  4. Step 4: Simplify right side
    838.19x = 824,736.07
  5. Step 5: Solve for x
    x = 824,736.07/838.19
  6. Step 6: Final answer
    x = 983.95

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1.5x scale

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.