Home / 1,478.40-2,038.29-1,211.86

Finding the Fourth Proportional to 1,478.40, 2,038.29 and 1,211.86

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Solution

The fourth proportional to 1,478.40, 2,038.29 and 1,211.86 is: 1,670.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.40 : 2,038.29 = 1,211.86 : x
  2. Step 2: Convert to fraction form
    1,478.40/2,038.29 = 1,211.86/x
  3. Step 3: Cross multiply
    1,478.40x = 2,038.29 × 1,211.86
  4. Step 4: Simplify right side
    1,478.40x = 2,470,122.12
  5. Step 5: Solve for x
    x = 2,470,122.12/1,478.40
  6. Step 6: Final answer
    x = 1,670.81

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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.