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Finding the Fourth Proportional to 1,386.18, 2,079.28 and 693.72

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Solution

The fourth proportional to 1,386.18, 2,079.28 and 693.72 is: 1,040.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.18 : 2,079.28 = 693.72 : x
  2. Step 2: Convert to fraction form
    1,386.18/2,079.28 = 693.72/x
  3. Step 3: Cross multiply
    1,386.18x = 2,079.28 × 693.72
  4. Step 4: Simplify right side
    1,386.18x = 1,442,438.12
  5. Step 5: Solve for x
    x = 1,442,438.12/1,386.18
  6. Step 6: Final answer
    x = 1,040.59

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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.