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Finding the Fourth Proportional to 1,386.45, 2,080.13 and 866.79

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Solution

The fourth proportional to 1,386.45, 2,080.13 and 866.79 is: 1,300.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.45 : 2,080.13 = 866.79 : x
  2. Step 2: Convert to fraction form
    1,386.45/2,080.13 = 866.79/x
  3. Step 3: Cross multiply
    1,386.45x = 2,080.13 × 866.79
  4. Step 4: Simplify right side
    1,386.45x = 1,803,031.55
  5. Step 5: Solve for x
    x = 1,803,031.55/1,386.45
  6. Step 6: Final answer
    x = 1,300.47

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1.5x scale

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.