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Finding the Fourth Proportional to 1,386.86, 1,913.79 and 812.13

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Solution

The fourth proportional to 1,386.86, 1,913.79 and 812.13 is: 1,120.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.86 : 1,913.79 = 812.13 : x
  2. Step 2: Convert to fraction form
    1,386.86/1,913.79 = 812.13/x
  3. Step 3: Cross multiply
    1,386.86x = 1,913.79 × 812.13
  4. Step 4: Simplify right side
    1,386.86x = 1,554,256.49
  5. Step 5: Solve for x
    x = 1,554,256.49/1,386.86
  6. Step 6: Final answer
    x = 1,120.70

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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.