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Finding the Fourth Proportional to 1,386.72, 2,079.63 and 565.11

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Solution

The fourth proportional to 1,386.72, 2,079.63 and 565.11 is: 847.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.72 : 2,079.63 = 565.11 : x
  2. Step 2: Convert to fraction form
    1,386.72/2,079.63 = 565.11/x
  3. Step 3: Cross multiply
    1,386.72x = 2,079.63 × 565.11
  4. Step 4: Simplify right side
    1,386.72x = 1,175,219.71
  5. Step 5: Solve for x
    x = 1,175,219.71/1,386.72
  6. Step 6: Final answer
    x = 847.48

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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.