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Finding the Fourth Proportional to 5,386.71, 8,079.83 and 1,688.86

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Solution

The fourth proportional to 5,386.71, 8,079.83 and 1,688.86 is: 2,533.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,386.71 : 8,079.83 = 1,688.86 : x
  2. Step 2: Convert to fraction form
    5,386.71/8,079.83 = 1,688.86/x
  3. Step 3: Cross multiply
    5,386.71x = 8,079.83 × 1,688.86
  4. Step 4: Simplify right side
    5,386.71x = 13,645,661.29
  5. Step 5: Solve for x
    x = 13,645,661.29/5,386.71
  6. Step 6: Final answer
    x = 2,533.21

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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.