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Finding the Fourth Proportional to 1,128.62, 1,696.80 and 913.70

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Solution

The fourth proportional to 1,128.62, 1,696.80 and 913.70 is: 1,373.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.62 : 1,696.80 = 913.70 : x
  2. Step 2: Convert to fraction form
    1,128.62/1,696.80 = 913.70/x
  3. Step 3: Cross multiply
    1,128.62x = 1,696.80 × 913.70
  4. Step 4: Simplify right side
    1,128.62x = 1,550,366.16
  5. Step 5: Solve for x
    x = 1,550,366.16/1,128.62
  6. Step 6: Final answer
    x = 1,373.68

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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.