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Finding the Fourth Proportional to 812.50, 1,117.71 and 712.47

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Solution

The fourth proportional to 812.50, 1,117.71 and 712.47 is: 980.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.50 : 1,117.71 = 712.47 : x
  2. Step 2: Convert to fraction form
    812.50/1,117.71 = 712.47/x
  3. Step 3: Cross multiply
    812.50x = 1,117.71 × 712.47
  4. Step 4: Simplify right side
    812.50x = 796,329.26
  5. Step 5: Solve for x
    x = 796,329.26/812.50
  6. Step 6: Final answer
    x = 980.10

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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.